This AP Products Sikaflex (R) Adhesive Sealant is used to secure gelcoat, fiberglass, metal and wood materials. Specifications•Used To: Gelcoat/ Fiberglass/ Metal/ Wood•Caulk Type: Polyurethane Sealant•Paintable: Yes•Color: Black•Unit Size: 300 Milliliter•Unit Type: Cartridge•Unit Quantity: Single Excellent Adhesion To Gelcoat, Fiberglass, Metal & Wood Over Painted After The Product Is Tack-Free & Can Be Sanded After Full Cure | AP Products SIKAFLEX 291 Caulk Sealant, 300 ML, Black