I may be the only one who had an issue with the POR 15 product, but on my KF-7 tank it was a disaster! I had the tank apart, so I was able to glass bead blast the inside of the tank. I figured that that would be clean enough! Well, their customer reviews said, "Enough sealer for several tanks". I cleaned out the tank, and poured the stuff in, turned it around to coat everything, and the poured the excess back into the can. I put the cover back on the can and placed it on my work bench. Well, after about 10 minutes, the can exploded and showered the contents all over my shop. I was very fortunate that very many valuable items were not covered, as they would have been ruined. (Lionel trains, and restored motors).. Then a few weeks later, I painted the tank and cured the paint in a hot room. The hot room ended up causing the sealer to fall off of the inside of the tank in sheets! I then had to reach through the fuel cap with a long probe and pliers to pull the sheets of sealer out of the tank. I was not happy. I called POR and the customer service representative said, "It states on the can, "Do not return contents to can"! I was holding the can in my hand, and could honestly tell them. "Not on MY CAN!!!!" It took forever to get the stuff out of the tank, as it was still stuck in a few spots. They sent me another can, but I have not used it.

Steve

You might want to try Locktite master gasket kit # 518 merc part no 92-12564 2 I have had good luck with it on 5 0r 6 tanks over the last 10 years or so it does a good job of replacing the cloth impregnated gasket they used in the 40’s