Before you apply it, check the weather. Since old concrete may have developed cracks throughout the years, you are going to want to make sure all cracks are filled. Whether it has been sealed before or not, it must be cleaned thoroughly before sealing or dirt, grime and any stains will be trapped beneath the sealant. If you are looking to seal a basement from moisture use a waterproofing concrete coating. For the best results, the concrete surface should be clean and dry. If the water soaks in, then you are good to start prepping for staining. It's always a good idea to check the product data sheet before using the sealer. The epoxy paints I like because they’re a chemical cure. © Copyright 2020 Hearst Communications, Inc. dustproofing and preserving new and old concrete HOW DOES IT WORK? Concrete sealant or paint prevents the adhesive from sticking properly. Once the concrete is properly prepared you can then go about sealing the concrete. If a previous sealer has been used you want to make sure it is removed by acid etching or grinding. You can power wash the concrete, or use trisodium phosphate and a scrub brush to remove stains. Recoat the surface every two years. If your concrete is new, you'll need to let it cure; wait at least one month before applying sealer. Before sealing old concrete you want to make sure you determine if the concrete has been previously sealed. If the previous sealer is compatible you may be able to reseal without removing the previous sealer. Answers to these questions aren’t easy to come by when you shop for sealers at a building supply store or on the Internet. You can power wash the concrete, or use trisodium phosphate and a scrub brush to remove stains. SEAL-A-CRETE penetrates into the concrete where it reacts with free lime and alkali to fill the voids and bond the particles into a solid mass, creating a permanent seal. Take some water and … Wait at least 30 days before sealing a new concrete surface—whether indoors or out—so that it has time to completely cure first. If you are applying an epoxy floor coating you are going to want to make sure you have good surface profile which can be achieved by acid etching or grinding the concrete. When it comes time, the sealing process for sealing an older, broken down concrete floor is the same as for sealing a new floor. Before sealing old concrete you want to make sure you determine if the concrete has been previously sealed. Once you clean all these agents off the top of concrete, you can begin preparing the surface. To make matters worse, there aren’t really any websites unconnected to companies that sell concrete sealers that give reliable information. For consumers well versed in concrete, as well as for homeowners who just want to protect their homes, the plenitude of information is overwhelming. If a previous sealer has been used you want to make sure it is removed by acid etching or grinding. However, more work must be put into repairing and preparing the floor beforehand. Scrapes from heavy appliances and furniture, cracks from seeping moisture, and dirt and grime can lead to problems for your otherwise pristine concrete flooring. The market for concrete sealers is crowded with products all professing the same level of protection, quality, and benefits. You want to make sure all mold, mildew, efflorescence, rust, grease and oil are removed from the concrete before sealing as you do not want to seal these elements into the concrete. You need to clean any paint, sealant or glues from the surface of the concrete. A penetrating sealer soaks into the pores and provides waterproofing in the same way that an oil finish penetrates wood, but if the concrete is dyed or stained, a surface sealant that remains on the concrete surface is more appropriate. A: Yes! 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