3M Urethane Seam Sealer, Grey, 310mL Cartridge-by-3M High performance general purpose seam sealer ideal for both interior and exterior seams and joints. Adheres well to primed metal and painted surfaces Can be smoothed to a featheredge or brushed Reduces the risk of redo's associated with the use of solvent-based seam sealers Tack free and paintable in 30-45 minutes.