These patches are a great option for repairing small rips and tears in your rain tarp without using messy silicone sealant. We have tested and verified these will work with the silpoly fabric used on our Heron and Pelican Rain Tarp. These patches can be used to fix damaged areas no larger than 3 inches long. Patch kit contains two patches, place one patch on each side of the hammock over the damaged area. Ensure the patch covers the damaged area entirely with a wide margin around the rip or tear on both sides.