HOW TO WATERPROOF, SUNBRELLA, MARINE CANVAS, BOAT TOPS, PONTOON COVERS, BOAT COVERS, BIMINI TOPS, AND BOAT T TOPS: 1. Thoroughly clean your boat cover with FABRI-KLEAN and allow to dry. 2. Spray on CANVAS SHIELD waterproof spray and allow to dry, and cure. Aurora Marine Canvas Shield is the best Fabric Guard to waterproof marine fabrics, boat covers and boat bimini tops with DRYKON the latest Nanoized Polymer technology. Restore Water Repellency of Boat Covers, Bimini tops and All other Marine Fabrics . Protects Marine Fabrics Against: Rain, Stain, Soil, Mold, UV and Color Fade. Non-toxic, PFOA Free, VOC compliant and Environment Friendly