I used a good part of a can on two of my garage gutters back when it first came out. On large cracks, I bent sheet metal flashing to help seal them up along with the Flex Seal. I sprayed them on a hot summer day, mid-afternoon, and they took a looooong time to dry. 24 hours after I applied the stuff, they still were not dry in spots. This was when it only came in black. I can only imagine how long it took them to spray that screen for the bottom of that boat the guy floats around in. It didn't really work all that well either. Maybe for a pin-hole in a wader it may work better, but I'd never buy it again. It reminded me of driveway sealer in a can more than anything when I was useing it.