We used Permatex shellac for everything from sealing gaskets, to sealing cuts and scrapes. The only thing I use the local parts box type stores for is a free place to dump my used oil. The loaner tool isn't any good either. I broke down and used one of their torsion bar tools for a late model Tahoe for a project my son in law had, and the threads were galled beyond use. We had to go to three different stores to find a descent one.