Flexible rubber, waterproof. Will not crack or become brittle. Clear sealers are not paintable but can be mixed with most automotive paints. Other colours are paintable. Clear Seam CJC: Clear 11 fl. oz. Cartridge Drip Seal TJC: Clear 8 fl. oz. Tube TJB: Black 8 fl. oz. Tube TJW: White 8 fl. oz. Tube Pumpable Seam Sealer BJW: White 3 Gallon Pale