Deeply penetrating wood waterproofing sealer that may be used as a preparation coat for SeaFin Super Spar Varnish or SeaFin Teak Oil . Hardens wood 15-25%, leaving no surface film. It provides sealing protection from moisture while preserving the natural look of wood. Excellent conditioner on any surface to be painted or varnished. Key Benefits Interior/Exterior Sealer and water repellent Helps stabilize wood Siding, decks and hot tub areas Marine use on ladders