Resistant to weathering, saltwater and stresses caused by joint movement. White, non-yellowing formula is ideal for above and below waterline applications where aesthetic appeal is a priority. Seals between mechanically fastened joints on wood, fiberglass, metal and most plastics. Applications include sealing deck-to-hull joints, thru-hull fittings, window and door frames, etc. It is also paintable. Highly recommended for ABS, Lexan and other plastics.