Star brite Waterproofing Water-based formula restores water repellency to marine fabrics, boat covers & bimini tops. It is also the easiest, most effective way to waterproof car covers, tents, tarps, foul weather gear, convertible tops and more. Star brite Waterproofing is also great for use on new fabrics, greatly extending their service life by providing an additional barrier to moisture as well as to damaging UV rays. Always apply Waterproofing outdoors, taking care to not breathe the solution. Waterproofing is safe for on all marine fabrics, including Sunbrella. If surface to be waterproofed is dirty or stained, first clean with Star brite Sail & Canvas Cleaner. Fabric to be treated must be completely dry. Apply enough Waterproofing with sprayer, brush or sponge to thoroughly wet top surface. Take care to avoid overspray, dripping or penetration onto surfaces not being treated. Let dry for 6 hours before using. Do not fold or store treated item until dry.