Answer
Sep 24, 2019 - 09:20 AM
These two products are similar, however we recommend our GBS Penetrating Concrete Sealer over the Waterstop as is penetrates deeper 3-4" into the concrete and chemically bonds with the substrate. It also carries a 15 year warranty against moisture intrusion and WaterStop has no guarantee. It is an ultra low VOC product with no odor or off-gassing once dried which only takes a day or two. One gallon covers 200 SF. Requirements for application: clean, dry, neutral pH and porous. If this concrete has been sealed or painted or power troweled it may need to be mechanically ground or chemically etched. Test porosity by dipping your fingers into a glass of water and spritz the surface in 5 different areas and watch to see how long it takes for the water to disappear. If it takes more than 5 minutes, then there is something prohibiting good penetration and it needs to be dealt with. If it soaks in right away and turns the surface darker, you are good to go. Please call 800-405-0222 for more information.
