While camping last month a small tree branch came down and punched a hole in my fiberglass roof.I didn't realise how thin that material is, probably less than 1/8" thick. Anyway I had a tube of Flexseal so I used it to fill the hole and make it waterproof.Now we're home and I have some Eternabond tape here so tomorrow it's back up on the roof and I'll tape over the Flexseal.