Thompson’s® WaterSeal® Thompson’s® WaterSeal® Semi-Transparent Wood Sealer Gold GallonThompsons WaterSeal Semi Transparent Wood Sealer provides long lasting exterior wood protection. Semi Transparent opacity adds moderate color and shows medium wood grain. Key Features Guaranteed 5 years on decks, 7 Years on fences and siding* Exceeds industry standard for ASTM D4446 for waterproofing wood Lightly tinted sealer and sunblock protects wood and enhances the wood grain Helps prevent water damage Provides a mold and mildew resistant finish