RampStar™ is an interior, quick-setting underlayment with excellent workability that makes screeding, ramping or patching fast and easy. RampStar can be used over concrete, terrazzo, ceramic or quarry tile, epoxy coatings, non-water-soluble adhesive residue and approved wood subfloors. Installation of common floor coverings using water-based adhesives can proceed as soon as RampStar is hard enough to work on without damaging the surface. Moisture sensitive adhesives can proceed after 16 hours of application.