When tent flies get sticky, backpacks start delaminating and rain gear begins to fail, make your favorite items waterproof again with Tent Sure by Gear Aid. Tent Sure is a polyurethane (PU) coating for waterproofing tents and outdoor fabrics. The high performance formula makes it easy to re-coat worn areas for longer life and total water resistance. You can use Tent Sure on tent floors, tent rain flies, awnings, boat covers, backpacks, rain gear and more. If it's made of synthetic fabric, Tent Sure can make it waterproof. The built-in foam brush makes application easy and the clear, flexible finish keeps gear looking like new.