HAZARDOUS! This item is considered hazardous freight. Additional shipping charges may be applied to your order at time of shipment. Seeks, fills and seals hidden leaks, cracks and annoying drips. Waterproof cabin roofs, decks, hatches, and entire hulls-wood, aluminum, steel and plastics. No fiberglass or canvas required! Readily accepts most topcoats with minimal preparation. Covers 90-100 feet per gallon.