Applied at the appropriate time, it will help the concrete cure properly while sealing it against stains that tend to penetrate the surface of the concrete. Acrylic Concrete Cure & Seal should never be used at temperatures below 50 degrees F or when rain is expected within a few hours. setting time. 5. QUIKRETE® Fast-Setting Underlayment should be allowed to air dry. No special curing steps are needed. QUIKRETE® Self-Leveling Floor Resurfacer QUIKRETE® Self-Leveling Floor Resurf acer is a self-leveling, self-finishing floor topping and underlayment specially formulated to work without troweling. With Bostik’s BEST ® urethane adhesive, costly and time consuming concrete moisture testing is no longer required for engineered hardwood flooring when the slab is properly prepared, dry to the touch, and fully cured. With newer construction, light weight concrete systems are designed right in as they lower building cost and increase build completion time. Most gypcrete products cure much more quickly than conventional concrete, which takes up to 28 days to cure unless a cure accelerant is used. Aug 13, 2018 · Curing: Gypcrete takes less time to cure at about 90 minutes. Shrinking: Professionals who have worked with the material claim that the concrete will shrink about any tubing where temperatures fluctuate, essentially creating a less efficient heat transfer from the tubes to the flooring slab. Gypsum concrete is a building material used as a floor underlayment used in wood-frame and concrete construction for fire ratings, sound reduction, radiant heating, and floor leveling. It is a mixture of gypsum plaster, Portland cement , and sand .