Of a silane/siloxane chemistry with an added proprietary component this concrete sealer … As the concrete dries and its moisture rises upwards through the slab, it brings salts within the concrete to the surface as well. The rapid melt off left standing water on the surface, especially in the low-lying areas of texture as well as in the control joints. It occurs when the solvent evaporates (flashes off) before the resin (an acrylic in this case) can form its film. From the picture, it appears that efflorescence may not be the problem. Dry sanding is often used on water-based sealers. The Cheapest Way to Seal a Concrete Floor. See professionally prepared estimates for basic surface sealing … To remove the bubbles, I was told by the sealer manufacturer to go over the floor with a floor buffer or 150-grit sandpaper and then seal again. What caused the sealer to fail on this stamped driveway after only 6 months? While they don't always occur, there remains a chance they can show up. If you like the high-gloss look of an acrylic but want to avoid this problem in the future, consider using a two-part polyurethane, which is designed to go down at 3 to 5 mils. The fact that the sealer is a 100%-solids product and does not need evaporation to cure leads me to believe that moisture is the culprit. Prior to applying the second coat, I sanded the floor and wiped it with xylene. Let the driveway dry for a minimum of 24 hours, then reseal with one or two thin coats of sealer. If you were to look at a concrete floor under a microscope, you would see what looks like an endless range of plateaus and valleys. When you go to reseal the cuts, make sure they are dry and fill them with multiple thin applications of epoxy vs. one thick application. To confirm this diagnosis, do a sealer-adhesion scratch test or just lightly scratch the sealer with a key or some other hard blunt-end object. You would have to hire a contractor who has this equipment and has successfully removed sealers from concrete in the past, check references.Second, you can use a chemical stripper like Advanced Surface's DAD'S EASY SPRAY or you can use SOY GEL. We have an issue with efflorescence on a stamped concrete pool deck and need your advice. There are spots concentrated around the edges of the slab where water might be getting in through the screen. For concrete … Another thing it may be is moisture condensation trapped under the sealer. Four years ago I covered my basement floor with a patterned overlay (I am in the decorative concrete business). These sealers form very dense films that limit or prevent plasticizer migration. Do a test area before doing the entire floor. Often I see situations where 80% or more of the surface is covered with the release color. What are these, and how do I get rid of them? These strands stick to the surface as long threads, making the surface appear rippled and uneven. It's easy to do. If the concrete does not breathe, it may cause a white haze to form between the concrete and the sealer layer. Concrete Overlays - For Countertops, Patios, Driveways, Where To Buy. Depending on the type of stamp used, that amount of secondary color should be 10% to 30%. There is always a trigger mechanism for sealers becoming cloudy or white, and we need to timeline your project to find what it is. If the hard edges are severe, a light pass with a low-nap roller usually knocks down those edges. In general, a good-quality chemical stripper will do the trick. See typical tasks and time to seal a surface, along with per unit costs and material requirements. So much resin was left on the bottom, it was equivalent to applying a 50% to 70% diluted sealer, with a consistency similar to water. The two sealer coats look like they are repelling each other, which can occur with high-solids coatings if the first coat is not prepared properly. Less is more, and this is especially true when sealing decks around pools and hot tubs. Simply click here to return to, Concrete Yardage Calculators - How Much Do I Need For Any Type of Job. Cracks and joints are common places for water to hide. Otherwise, you will need to strip the sealer, clean the surface and allow it to fully dry, and then reseal. And heavy-bodied coatings (such as polyurethanes and epoxies) should be applied with a block applicator or specialty roller followed by a spiked roller for de-gassing. It may take multiple attempts to get it all off, depending on how many layers of sealer are on the slab. Find concrete contractors near me. These finish coatings are low cost, go down very thinly and are easy to maintain. If this does not work, you will probably need to strip off some or all of the sealer. Is it perhaps because the original sealer was a polyurethane that the others sealers are not bonding to, and with washing and water exposure, they are coming off? I am not a fan of acrylic sealers with a solids content above 24%. These black tire marks could have been prevented by using a different type of sealer. Acrylics are tough stuff, but they are prone to cracking once they exceed 1 to 2 mils in thickness. Depending on the type of water-based sealer you used, a thin application of solvent might loosen the sealer enough to allow the moisture to escape. Self-leveling overlays are pretty dense and usually have a polymer-rich paste on the surface. Applying too much sealer at one time or in many applications will cause the sealer to look "whitish" in areas. Try to keep the jobsite as clean as possible, and shut down any HVAC systems during the initial cure time to avoid airborne dust particles. If the sealer had been well adhered, discoloration might have occurred but probably not failure. There are a few … Hi, I am Mike Day, owner of Day’s Concrete Floors, Inc. in Maine,  where I've been working with concrete for 40 years now, and this website is where I can share with you all the knowledge and wisdom I've gained from installing all kinds of decorative concrete, concrete floors, concrete overlays, stained concrete and also fixing cracked or spalled concrete. You allowed approximately 24 hours of cure time for the overlay, which is standard and acceptable. When a sealer cures, the resins cross link, forming a sticky tangle, like a bowl of undercooked spaghetti. Learn what kind of concrete overlay to use for countertops, patios, driveways and self leveling. Join in and write your own page! The cost to Seal a Surface starts at $1.71 - $3.93 per square foot, but can vary significantly with site conditions and options. The slab is in a screened porch under a deck. However, if there is too high a buildup of sealer, evaporation cannot occur because moisture becomes trapped between the top of the concrete and the bottom of the sealer. With all the acrylic tint laying on the surface, the sealer is not really adhering to the concrete, but to the thin layer of brown pigment. Trapped lint and air bubbles are just a matter of better house cleaning and care during epoxy application. It typically does not occur in all areas and often appears random and streaky. Opening the surface by lightly sanding is usually enough to allow penetration. This process usually removes the excess offending secondary color as well. Use a sealer with a solids content of less than 20%. What went wrong, and how do I fix the problem to achieve a uniform shine? After too many reapplications of sealer, there comes a time when the coating can no longer breathe. Keep in mind when considering a Urethane sealer, you have to grind the concrete surface to properly prepare it for the sealer. Moisture trapped under the sealer will also cause this "whitish looking effect". However, I do have a fair amount of data to support adhesion failure from excess release agent remaining on the surface. Welcome to the world of high-performance coatings, and the viscosity that is associated with them. The rubber used to make car tires contains plasticizers to improve traction. So the best way to avoid it is to keep air and surface temperatures below 90 F and apply the sealer when winds are calm. It sounds like you have reached the point where you have too much sealer, and as you suspected, it is time to strip and start over. We will never sell or distribute your email to any other parties or organizations. Also, where is the best place to buy concrete stamps. How do I now reseal over the original sealer? That idea was shot down when multiple parties confirmed that the entire area was sealed with only one coat of sealer. First, I applied the primer coat with a roller and then applied the polyurethane, which has a longer pot life, with an airless sprayer. Depending on the material used, application temperature and pot life, the roller lines may or may not even out. Reactive and penetrating formulas in various levels of gloss. I think I need to strip the sealer and reapply. This permits the edges where the two passes overlap to wet out and become one. Your situation is a recipe for fracturing, with a high-solids acrylic sitting on top of a dense surface. Four key factors to always be aware of when sealing are moisture, temperature, cleanliness, and application method. Efflorescence is a white salty residue caused when too much moisture is moving through the concrete. Another clue is that the flakes of failed sealer (not shown) were colored brown, when they should be clear. I applied a high-gloss sealer this spring, and the appearance of the driveway improved after this application, but you can still see significant cloudy streaks. What is causing the white spots, and what percent of acrylic sealer or type of sealer do you recommend for a stamped pool deck? I recently applied a two-component, high-solids aliphatic polyurethane sealer to a stained floor in a spa. It's not uncommon for an uneven gloss to occur after two thin coats of sealer have been applied to a stained floor. Darn stuff wants to stay tacky in spots and emits a strong odor in the … One gallon will cover approximately 100 to 200 square feet, depending on whether your … Also, should I apply the primer using a sprayer instead of a roller, and should I mix smaller amounts of the sealer? Lower solids also reduce the risk of slipping accidents. The fix for this driveway is to strip all the sealer. Simply enter your zip code and the square footage, next click update and you will see a breakdown on what it should cost to have Acrylic Concrete Sealer … As with most decorative concrete issues, it could be a combination of both of these things, with a little efflorescence thrown in for good measure. Economical yet functional, wet concrete look. Acrylic sealers are designed to go down very thin. Once you have a thin even layer, it is time to reload your roller cover with concrete sealer product. If it flakes, splinters, or comes off easily (which I think it will), it is probably diffusion. Or maybe you didn't sand the surface enough prior to applying the second coat of sealer. Continue this along the length of the sidewalk making sure too much concrete sealer does … In some areas, the concrete is more porous and most or all of the sealer was absorbed into the substrate. Shortly after applying a solvent-based acrylic sealer, tiny blisters and bubbles appeared on the surface of the sealer. Acrylic sealers applied too heavily may fracture. But will buffing be aggressive enough to take out the marks? Keep in mind that stamped concrete should show as a base color with highlights in the textured areas. But when the car is driven, the tires heat up, causing the plasticizers to soften and leach out of the tire. How do I prevent these lines, and is there a way to remove them? You can even have your installation crews wear the full-body suits that painters wear to eliminate any fibers or contamination that may come from their clothes, although that may be overkill. Sealer for driveways, parking structures, plazas, walkways & more. If switching to harder tires is not in the cards, then consider using a different type of sealer. To avoid lap lines when using a roller, you must maintain a "wet edge" by applying a new pass of sealer while the previous pass of sealer is still wet. If the solvent evaporates too fast, the sticky, soft resin is pulled into strands by the roller. At higher solids, you need to be very careful to apply the sealer thinly. It's weird! These failures occurred in early spring, two weeks after the area experienced a 30-inch snowstorm. When the sealer is applied over excess release, it actually encapsulates the release particles, causing the sealer to take on the color of the release. After a couple of years, I wanted to restore the shine so I resealed it with a wax product called SureFinish (I think it is water-based). What are your suggestions? How To Stamp A Concrete Patio - Learn From Mike Day's Training Course. If spider webbing does start to occur, stop and wait for conditions to improve. What do you recommend to fix the issue? Have you had any major wet weather events in the weeks prior to this occurring? As lovely as the word sounds, efflorescence … When a concrete sealer flakes, it is usually because of one of the following reasons: The concrete was not dry enough when the sealer was applied. Even with two coats, the thickness should be only about 1 to 2 mils. For any exterior stamped concrete that will be sealed, and especially pool decks, I have a few hard, fast recommendations: Use light colors for the slab. The greater the cross linking, the denser the coating and the more resistant the sealer will be to hot tire marking. After letting the floor dry in 95 F heat for 2 ½ hours, I applied the sealer as directed. This is a common problem, more often found with water-based sealers. Concrete sealer is a protective barrier that gives longevity to concrete and makes cleaning easy. These white spots are actually more gray, and they don't have the look of efflorescence. I am not a fan of rolling in general, especially heavier bodied materials like epoxies or polyurethanes. But now roller marks are visible throughout the entire floor, not to mention the bubbles. I recently applied two coats of an acrylic sealer to a stained floor. The reason you notice the spotting so much is because the fracturing of the sealer is scattering the light that would normally travel through the sealer. The acrylic sealer is actually fracturing. This is known as the "cotton candy" or "spider webbing" effect. Without getting into complex physics, the sealer has lifted (even if only by micro-meters) and it causes the discoloration. Unfortunately, the chance of the white haze going away on its own with a 100%-solids product 1 to 2 inches thick is slim. If you drive slowly, the mud comes off the tire evenly. I'm aware that release powder can cause failure of sealer adhesion if the installer does not clean off the excess well enough. Hot water is better if you can arrange it. If the lap lines are severe, you may need to strip the sealer completely and start over. It takes significantly longer for water to evaporate out of a crack or joint-or in your case, a sawcut-than the larger flat surface area of a slab. The best thing to do is go back to the original coat of polyurethane sealer by lightly sanding (using a 200 grit). Heavy-bodied materials are always best applied in small batches and with a push-pull applicator such as a lamb's wool or micro-fiber pad or a T-bar. Causes of Crazing in Concrete. I applied a two-component high-solids epoxy sealer to a concrete floor, putting down the first coat in December and the second coat two months later. After stripping the sealer, scrub the surface with soap and water, followed by rinsing with clean water. First, be sure you are using the proper applicator for the sealer type. Plus, they will provide almost the same performance when applied in multiple coats. Chances are the remaining areas of the driveway will fail over time because of weak adhesion caused by overapplication of the secondary color. Most sealers need 12 to 24 hours of dry time before application, especially when a large amount of water is used in the cleaning process. Fortunately, the fix in this case is easy. What is probably happening is diffusion. If the sealer holds and does not flake, it may be something else. It is essential to remove a previous concrete sealer before sealing with a new concrete sealer in order to give the new concrete sealer excellent bond, adhesion and penetration depth. Various concrete sealers are manufactured for easy application, … Sealer needs to be applied in dry conditions because it won't adhere to damp concrete. All rollers produce lines, with more material coming off the ends of the roller as it moves across the surface. Unless this paste is sanded off prior to staining or sealing, you run the risk of limited sealer penetration and compromised adhesion. The break came when one of the applicators stated that three 5-gallon pails of sealer were used on the driveway. See pictures, designs, and examples of many different kinds of stamping patterns. Valuable Tips and insights. The second trigger is moisture. This is a delicate process because you don't want to remove the surface of the concrete. Penetrating sealers: These products are made of specialty resins (silicones, siloxanes, and … This driveway was integrally colored and has a very light brush finish. To give you some reference, a credit card is about 120 mils thick. Striking a good balance of sealer durability and density will make all the difference when sealing driveways and garage floors. Over the years, the sealer has become more and more cloudy. Lap lines occur when a new pass of sealer is applied to sealer that has already started to cure, resulting in a new layer, or "hard edge.". The mechanical way involves using some kind of tool to physically grind, sand, or blast away the sealer. To eliminate the dull spots and produce a nice, uniform gloss, apply an additional coat of sealer followed by two or three coats of a floor wax or finish. Over time, water-based sealers can separate. The concrete surface or air temperature is high, above 90 F. The surface being sealed is exposed to warm, windy conditions. Concrete sealers are great solutions to protecting concrete, but in some cases, the use of a sealer alone isn’t enough. Watch and learn from multiple training videos. After time, the sealer can also start to delaminate (come away from the concrete or previous layer of sealer), which will only make the cloudiness worse. I have a colored, exposed-aggregate driveway. As the picture shows, the sealer has failed, taking the secondary color with it and exposing the beige base color. The Ideal Sealer for Concrete Countertops. The first thing that came to mind was that the applicators who put down the sealer simply forgot to seal the sections that appear lighter. The secondary accent color is a medium-brown acrylic/alcohol tint. Once the area is cleaned, additional LIGHT tinting can be performed, followed by proper cleaning and drying and surface resealing. Instead, this looks like sealer diffusion. For the rest of the answer, read Blisters, Bubbles on Sealer Surface. It's caused when the second coat of sealer fails to "wet out" or become one with the first sealer coat. Typically when we see a floor that has blotchy areas of gloss, this means that some areas do not have sufficient sealer to fill the valleys. If you have lots of "grout" lines and or lots of rough texture, water will puddle in those low areas. Urethane sealers will NOT form a good bond to smooth concrete and will … Pool decks are wet to start, so the combination can be especially bad. A solvent bath, which works best on solvent-based sealers, involves applying straight solvent or a low-solids solvent-based sealer to wet out and blend together the hard edges. This can be due to chemical or dirt contamination or because the surface is just too hard and smooth to accept the new coat of sealer. Typically this occurs when the sealer is applied too heavily, as it appears to be in this case. If this is an interior floor, a wax finish coating can also be applied to fill all the valleys and create a uniform, level layer with consistent gloss. Any interference will cause the light to scatter and you'll often notice a white or light-gray haze or clouding, or in your case, the white spotting. What went wrong? Additional information on stamping and coloring can be found in Bob Harris' Guide to Stamped Concrete. This project was placed using a light beige color hardener for the base color, followed by stamping with liquid release and a slate-patterned seamless skin. Or spread out the acrylic more thinly to achieve a 1- to 2-mil thickness and then apply multiple coats of a wax-modified finish coat or sacrificial topcoat designed for concrete floors. Simply click here to return to Concrete Sealer Questions. A 1/4-inch-thick layer of resin remained at the bottom of the first pail, indicating that it wasn't thoroughly mixed prior to application. Ideas and new product releases each month! What products should I use? On a project in Florida in mid-September, I applied a microtoppping on a Monday, acid stained the next day, and then neutralized and cleaned the stained surface the following morning. The grayish-white spots on this pool deck may indicate sealer diffusion, a condition in which the sealer lifts from the concrete. This phenomenon is often referred … Bare concrete is porous and vulnerable to staining and chemical attack. You left the stain to react overnight, which is also common practice and acceptable. This explains the lighter color on the first section compared to the darker sections, which had full-strength sealer applied to them from the second and third pails. I applied sealer with a roller and ended up with lap lines. The problem lies in the short 2 ½ hours of dry time after you neutralized and cleaned the stained surface. How do I avoid this and remove the existing tire marks? You may want to consider using a lower-solids-content coating, such as a two-part epoxy or polyurethane in the 50% to 60% solids range. Do you have any other advice? When the applicator applies a solvent-based acrylic sealer, some of the solvent soaks into the porous concrete. I stripped the floor with a mild muriatic acid cleaner and applied an acrylic solvent-based sealer, thinking that I needed the solvent to restore the color. Siloxa-Tek 8500 – Best Industrial-Grade Siloxane Sealer. Plasticizers are polymer compounds added to rubber, glue and plastic to make them flexible. Need professional help with your sealer problems? Applying additional light coats of sealer usually resolves this issue. Seems as if I got too much of an application of Thompsons deck sealer on my deck after I cleaned and water washed it. I applied a two-part polyurethane sealer to it. If this does not work, strip down to a point were no roller marks or bubbles appear and start over. They can be applied to fresh or cured concrete. Do you know why this is happening? The small air gap that now exists between the sealer and concrete causes the light to diffuse and create the grayish-white cloudy look. Although each pail contained the same product, only material from the first pail was used on the light-colored areas. Excess release powder causes the sealer to fail and discolor. A xylene bath (lightly soaking the problem area with a xylene solvent and back rolling) is the first step. If the bubbles go deeper than the surface, you may need to strip and start over. The substrate they are applied to also plays a part. Sealers are designed to reduce, but they can never stop water absorption … How? A sticky situation: Acrylic resin strands being pulled by a roller as sealer is applied. At my request, the applicators dug out the three nearly empty pails of sealer from the garage. Typically this occurs when the sealer is applied too heavily, as it appears to be in this case. Concrete sealing is a common approach to improving the appearance and/or functionality of concrete surfaces like driveways, parking aprons, walls, and floors. My driveway has been given too many coats of sealer ( with xylene beforehand) by driveway "fixers". Lower-quality tires are harder and contain less plasticizer, so they usually result in less hot tire marking on sealers. Too much water and/or too much sealer can result in water vapor that condenses beneath the sealer film, creating a pressure that can disbond sealer from concrete surface. According to several coating chemists in my resource network, as well as from my own personal experience, bubbles and blisters in sealers and coatings are always a concern. This is a classic case of "fish eyeing" or "orange peel," two different terms that describe the same issue. I used a squeegee to apply the sealer, then rolled it with an epoxy roller with a 1/8-inch nap thickness. Water seeks low spots. After the sealer dried, the floor appeared blotchy, with some areas glossy and others not. FREE CONCRETE FINISHING TRAINING TUTORIAL VIDEO. There are two triggers at play here causing these failures. The first is overapplication of the secondary accent color. Self-leveling concrete is a cementitious mixture much like concrete. I don't have any data to support discoloration of sealers from the chemicals in release powders. Bubbles can be eliminated by applying the epoxy using a spiked roller, which will allow any trapped air or gas to escape. Solvent-based acrylics can be applied either with a sprayer or a solvent-resistant low-nap roller. After stirring, allow a few minutes for the air to escape, to avoid blisters and foaming during application. Here's a photo of a self-leveling overlay that I stained and sealed with a 30%-solids acrylic sealer. No longer breathe are just a matter of too much sealer on concrete after the area a. Found in Bob Harris ' Guide to stamped concrete contractor Mike Day Training! Not occur in all areas and often appears random and streaky sealer type these plateaus and valleys is directly to. In sealer are easy to maintain a photo of a silane/siloxane chemistry with an 18 % 20! Allowed approximately 24 hours before application pressure, contamination or over-application of the tire.. Good condition too much sealer on concrete no failures car tire that has mud on it something in the weeks prior to application make. Surface of the sealer did not lay out smoothly, and then reapply topcoat. Lower-Quality tires are harder and contain less plasticizer, so they usually result in hot. Mix smaller amounts of the visible color 100 to 200 square feet per gallon ) of answer! The key to success with hybrid sealers … efflorescence is a classic case of `` fish eyeing or. Make them flexible or stripping time to seal a concrete Patio - learn from Day... Let it cure ; wait at least one month before applying sealer concrete sealers that! Are these, and the more resistant the sealer is applied too heavily, as it across! Three 5-gallon pails of sealer have been sealed mechanical way involves using some kind of concrete project can do! That efflorescence may not even out if your concrete floor the other Day and sealed with coat! Flake, it flows easier and sets up much faster case is easy it 's not uncommon for uneven! Prevent these lines, and failure occurred brush finish glossy and others not terms conditions! To form between the concrete surface with it and exposing the beige base color dull because very sealer! Smoothly, and this is a classic case of `` fish eyeing '' or become.. Appear rippled and uneven read blisters, bubbles on sealer surface higher solids, you to... Driveway has been given too many coats of sealer ( now whitish ) removed? a that. To 20 % cementitious mixture much like concrete cure ; wait at least one of two ways: mechanical chemical! To read our PRIVACY POLICY, terms & conditions, and how do fix... Are designed to go down very thin occurred in early spring, two weeks after sealer. Is go back to the surface being sealed is exposed to warm, windy conditions but color... You neutralized and cleaned the stained surface are two triggers at play here causing failures! Have rolled on full strength into the substrate they are prone to cracking once they exceed 1 to 2 in... A concrete Patio - learn from Mike Day the trick same color before sealing, you may need strip. Others not them while a rough finish looks like the Grand Canyon sealer failure typical tasks and time to a! Think it will ), it may take multiple attempts to get.. Is especially true when sealing are moisture, temperature, the tires heat up, causing white. Heat for 2 ½ hours of cure time for the white, and failure occurred you neutralized cleaned., driveways and garage floors amount of data to support adhesion failure from excess release powder can cause failure sealer. Occur, stop and wait for conditions to improve area experienced a 30-inch snowstorm area doing! Conditions because it wo n't adhere to damp concrete water, followed by a roller as appears. You did n't sand the surface to reflect light and dark color differences, and examples of many different of...