This patch kit is designed to adhere to your poly liner in any area where you can get to it, above water. Excellent for repairs after the season or in preparation for the new season. Trim the area where you have had a misfortune and dry it. Prepare the patch and place it over your damaged area. Get your hair dryer and apply heat just like the sun. It may take a few minutes (literally. Time it!). It works like no other. It even works with cold temperatures. Just increase your heat, but be careful not to melt your poly liner.