J-B Weld 8271 KwikWeld Professional Size Steel Reinforced Epoxy Twin Pack - 10 oz. (2)

I have a 1968 camper that had an unusual pressed aluminum seam that no matter what you did, using some of the best known products (including polyurethane 5200 for marine seams!), would not stop leaking. Finally, I put all this JB Weld the seam could hold, then a protective topping of this JB Weld on top of the initial seam fill. It's a good thing I did, for we went camping the next day where it rained a lot and extremely hard that day. For the first time in YEARS, not one leak, not one drop of water, on that seam. I just knew JB Weld could do it and was the likely ONLY product that could, and it DID. I will use it on the nail head tops causing leaking on my garage roof now. If only larger amounts were sold, however, that it exists at all really helped A LOT.