If the surface to be waterproofed is dirty or stained, clean it with Star Brite Sail & Canvas Cleaner. Fabric to be treated must be dry. Apply enough Waterproofing with sprayer, brush or sponge to thoroughly wet top surface. Take care to avoid overspray, drips or penetration onto surfaces not being treated. Allow the treated item to dry for 6 hours before using it. Do not fold or store treated items until dry. Use only in a well-ventilated area.