DEFY Crystal Clear Composite Deck Waterproofing Sealer, 1 Gallon WATER-BASED, CLEAR COMPOSITE DECK SEALER  This environmentally friendly, water based, clear wood and deck sealer protects composite wood from the harmful effects of the sun, while adding little to no change to the natural look of your composite deck. FORTIFIED WITH ZINC NANO-PARTICLE TECHNOLOGY Its like sunscreen for your wood. Tiny zinc particles dispersed throughout the stain reflect damaging UV rays, preventing premature graying and color loss. EXTREMELY DURABLE, HIGH QUALITY RESINS  DEFY Composite Deck Sealer is made with the highest quality resins available that have better resistance to fading and darkening. The result is a quality sealer that typically lasts a season or two longer than competitive products. ENHANCED MILDEW RESISTANCE  The same zinc nano-particles that block damaging UV rays are also a natural deterrent to mold and mildew growth. EASY TO MAINTAIN  When its time to do a maintenance coat, theres no need to strip the surface. Make sure the surface is clean, then apply a single maintenance coat of DEFY Composite Waterproofing Sealer.