Using Seam Grip TF is easy. First, make sure the fabric of your tent, rain fly, or tarp is clean and dry. Then, use the built - in foam applicator brush to apply the sealant evenly on the areas that need waterproofing. One 4 fl oz bottle can cover up to 85 sq ft. For best results, apply it in a well - ventilated area. When applying, avoid getting it on your skin as it might cause irritation. After use, store the bottle in a cool, dry place. If you notice any remaining sealant on tools or surfaces, clean it up right away with a suitable solvent. With regular application of Seam Grip TF, your outdoor gear will stay waterproof and in great shape for a long time.