For installing Rubber Floor Tiles or Rolls over suitable on-grade dry concrete floors, suspended concrete floors, or suspended wood floors. May also be used with sanded back molded rubber stair treads. Not recommended where excessive moisture exists; Non-Carcinogenic; Non-Toxic; safe for the environment and freeze thaw stable. See label for complete instructions. Ready to trowel in 1 gallon or 4 gallon cans. Covers 150 square feet per gallon. PLEASE NOTE ADHESIVE IS NOT RETURNABLE. See Specs.