Thompson's WaterSeal Signature Series Clear Exterior Wood Stain and Sealer (1-Gallon)Thompsons WaterSeal Clear Wood Sealer provides long lasting exterior wood protection. Clear sealer enhances and maintains the woods natural color. Crystal clear sealer and sunblock protects wood and prevents yellowing Helps prevent water damage For use on: decks, fencing and siding Provides a mold and mildew resistant finish Exceeds industry standard for ASTM D4446 for waterproofing wood