Natural Qwik Seam rubber seam sealer. Quick dry, extra tough seam sealer formulated to dry through a paint film. Skins in minutes. Will not crack, peel or become brittle. Tools easily. Flexible, paintable, waterproof, non-sagging, non-staining, extra tough yet remains permanently flexible. Also available in brushable form. CJN: Natural 11 fl. oz. Cartridge CJB: Black 11 fl. oz. Cartridge TJN: Natural 11 fl. oz. Cartridge WFS: Extra Nozzle for TJN