These areas look dull because very little sealer remains on the surface to reflect light and produce gloss. • You will often see efflorescence (white minerals) or mold growth on damp concrete. When I wash the floor it looks great, but the dull spots show up when it dries, and over time I'm getting more and more spots. You don't want a protective finish that will wear away after only a year or so. If you drive slowly, the mud comes off the tire evenly. Why Use a Sealer on Your Concrete Floor? You hit the nail on the head in regard to humidity. It's best to wait for days when it's not rainy and the humidity isn't too high to help the floor dry faster. The interior humidity has been high (around 70%) due, I think, to rainy weather and wet drywall mud. While applying the primer on the first half of the floor, I could see roller marks and bubbles and the primer started to string up on me. Original Waterproofing Sealer protects vertical Seal-Krete 5 Gal. Four key factors to always be aware of when sealing are moisture, temperature, cleanliness, and application method. When the moisture readings drop low enough for you to seal the concrete (at or below 4 pounds), apply the sealer in the afternoon or evening, when humidity is lowest. Answer: I think you are on the right track in terms of the other sealers not bonding to the original polyurethane sealer. Beginning her career at newspapers such as the "Marietta Daily Journal" and the "Atlanta Business Chronicle," she most recently worked in communications and management for several nonprofit organizations before purchasing a flower shop in 2006. Test this remedy in a small area first to make sure it is working. Concrete is porous and loves to hold moisture. Question: 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. Pay special attention to the corners and edges of the floor, where cracks can let extra moisture seep in. After letting the floor dry in 95 F heat for 2 ½ hours, I applied the sealer as directed. Stained concrete, a floor overlay, a polished and dyed floor? Now you have multiple layers of different sealers, all of which seem to be wearing. I just completed a moisture test (using a calcium-chloride test). This moisture will stay in the concrete until the moisture content of the air above the slab abates. That being said, you have a slab that should eventually drop below 4 pounds because of the vapor barrier. General-purpose, 100% acrylic, interior and exterior floor primer. Answer: This is a case of chemical versus mechanical bonding and solids content. Picture a car tire that has mud on it. Question: I recently applied a two-component, high-solids aliphatic polyurethane sealer to a stained floor in a spa. But now roller marks are visible throughout the entire floor, not to mention the bubbles. The life expectancy of a sealer depends, in part, on exposure conditions and how well the floor is maintained. Economical yet functional, wet concrete look. After drying for another 24 hours, the floor should be ready for new carpet or paint without dampness. Learn more about the types of concrete sealer. Concrete's porous nature means that water from under your home can seep up through your concrete floor, making it damp. Be sure to check with the sealer manufacturer to verify the compatibility of its product with the decorative surface it will be put on. Therefore, it's advisable to have a floor tested for moisture content prior to installing flooring or moisture barriers. 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. Vacuum or sweep it thoroughly, then scrub it with a mop. Avoid moisture by using a dehumidifier in the basement. Continue drying the floor until your dampness test with the plastic square stays dry overnight. Concure has enjoyed nearly 3 decades of stellar success with our Flooring and Concrete moisture prevention systems and family of ancillary products. Answer: 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. This floor is on grade, and the concrete is over two months old with a vapor barrier under the slab. Protects from water, staining, and abrasion. First, I applied the primer coat with a roller and then applied the polyurethane, which has a longer pot life, with an airless sprayer. So in this case, moisture was trapped under the sealer, causing the white, blotchy haze. A dehumidifier can help draw out the water, or a floor fan can help circulate the air and speed evaporation of the dampness. Applying a water-based wax and then a solvent on top was also not a good idea. When it comes to sealers, you get what you pay for, says technical expert Chris Sullivan. There is always a trigger mechanism for sealers becoming cloudy or white, and we need to timeline your project to find what it is. Polished Concrete Basement Floor Cost. Seals concrete against water seepage, water vapor. Time: 01:49 For deeper cleaning, rent a rotary floor scrubber with and abrasive pad designed for concrete and use it to apply trisodium phosphate, or TSP, to the floor. In other areas, the sealer has saturated the surface of the concrete while leaving the desired film on the surface. Learn more about the types of concrete sealer. Is 4 pounds a strict guide, or are there some tolerances? The floor looked great at first, but after about a month it began to dull again in spots. Before drying your floor, clean it well to remove dirt and any built-up mildew. Where a sealer coat starts to come off, light no longer travels through it but instead diffuses, resulting in dull or white and hazy spots. Time: 01:30 I am not a fan of rolling in general, especially heavier bodied materials like epoxies or polyurethanes. Most sealers are clear, which can make application tricky, as even coverage is key to preventing future dampness in your concrete floor. These finish coatings are low cost, go down very thinly and are easy to maintain. A smooth finish has fewer of them while a rough finish looks like the Grand Canyon. Use a sealer designed for concrete moisture protection, such as an epoxy concrete sealer, which often comes in two parts that must be mixed immediately before applying. What causes this, and should I apply more sealer to remedy the situation? It's best to paint small areas at a time to ensure complete coverage with a thin layer of sealer; too much sealer can lead to bubbles as it dries. Question: I applied two thin coats of a high-gloss sealer to a stained concrete floor, following the manufacturer's instructions, but some areas of the floor look dull instead of shiny. Learn more about checking the VOC content. Why did the two-part polyurethane peel off, while the one-part solvent-based acrylic is still down and performing great? Smith Paint Products 2200 Paxton Street Harrisburg, PA 17111-1038 Office: 717.233.8781 Toll Free: 800.466.8781 (US) Facsimile: 717.232.5199 Not Yet Rated ArmorSeal Tread-Plex Water Based Acrylic Primer. If you speed up, the mud flies all over and leaves more prominent marks on the outside edges of the tire. Concrete is technically porous, which means that unless those pores are sealed up with some other material, the concrete can absorb liquids and stain. What went wrong? Sealing the concrete … The essential tool for hobbyists. The higher solids content makes them less able to penetrate the concrete surface, thus requiring additional surface profiling to promote adhesion. 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. They can be applied with a micro-fiber mop, and they dry in a matter of minutes. Today, high quality concrete sealers can block up to 99% of surface moisture. Many people opt for having their floors professionally sealed by a local concrete contractor. Also, read the label, because in this case it clearly stated minimum dry times of 12 to 24 hours before application. But I understand the recommendation is no more than 4 pounds. Basements and garages - the typical rooms with concrete floors - also suffer from poor air circulation, giving the moisture nowhere to go once it seeps through the floor. Most manufacturers of high-solids sealers require a well-defined profile before application of their products. The lighter areas may be a sign of higher than desire moisture causing the color pigment to dilute. We caution against the Plastic Sheet Method for testing moisture levels in your concrete slab. This can cause issues with mold and mildew, especially if you have carpet or furniture on top of the concrete. Avoid the temptation to pinch pennies. In the category of film formers, however, you'll find several different types, each with advantages and limitations. The bleach has the added benefit of helping to kill mold and mildew that might have accumulated on the floor. If you have a concrete floor that’s in continuous contact with a source of moisture, you’re going to have problems. Epoxy Basement Floor. The other major factor is solids content. Answer: It's not uncommon for an uneven gloss to occur after two thin coats of sealer have been applied to a stained floor. Concrete slabs and floors can be excellent subfloor surfaces for tile and other floor coverings, but too much moisture in the concrete can cause problems with flooring installations. Conversely, one-part acrylics bond both mechanically and chemically with concrete and are lower in solids – typically 20% to 30%. All rollers produce lines, with more material coming off the ends of the roller as it moves across the surface. Do you know why this is happening? For the best results, the concrete surface should be clean and dry. Epoxy Bonding Floor Primer is designed for use on bare concrete surfaces in indoor and outdoor spaces. The same reason two-part polyurethane sealers don't chemically bond to concrete is also what makes them such good sealers. Otherwise, you will need to strip the sealer, clean the surface and allow it to fully dry, and then reseal. How to Seal a Concrete Floor Before Applying Vinyl Tile, How to Seal Stained Concrete Floors and Get a High Gloss, How to Get a Concrete Floor Ready for Linoleum, Radon Seal: Basement Waterproofing, Radon Mitigation, and Concrete Repairs Made Easy, Concrete Sealer Store: 10 Easy Tips to Concrete Sealing, How to Clean Concrete Floors to Install Engineered Flooring, How to Clean Your Laminated Floor and Leave it Streak Free, How to Prepare for Laying Tile Over a Concrete Floor. Completely cover a small area with a thin layer of sealer, then move on to the next area. This is why a vapor barrier under concrete is essential. Concrete floor sealers protect, enhance and preserve the appearance of your floors. 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. At Lowe's.com saturated the surface circulate the air conditioner to help remove moisture outdoor spaces can visual! 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