CARB (California Air Resource Board) compliant adhesive meets state of California air quality management new ordinance requirements. Low solvent, high-strength. Specially formulated adhesive to provide a strong, waterproof bond to most bath surround products without harming the substrate material. Recommended for most plastic tub and shower enclosures over structurally sound drywall, plywood, hardboard, and ceramic tile. Also recommended for polystyrene foam backed tub kits (except over ceramic tile). Up to 20 minutes open time. No bracing required, press into place. Flammable.