Pour It On. Pro Spec Level Set Deep Pour 3 is a self-leveling non-gypsum underlayment that can be poured up to 3 inches thick in a single lift. The calcium aluminate cement (CAC) formula cures smooth and flat with no troweling required and protects finish flooring from alkali in the concrete below. A 50-pound bag sells for about $17. Bonsal American, 800/738-1621, prospec.com.