Ultra Flex is a rapid curing, flexible seam sealer designed for all types of painted surfaces, bare metal and primed surfaces. It is resistant to weather exposure and temperature variations. Paintable and sandable. It remains flexible and seals wet or dry. Use to seal seams in floorpans, fire walls, truck seams, wheel sells, etc. Brush marks duplicate original factory finish. Skins in 5 minutes. Air drys in one hour.