You'd think if it was glue that a lot of people would have lost them. BUT back then they didn't care if the glue ate holes in concrete and made you have two headed babies, they used stuff that WORKED. lol It's mighty thin to spot weld, plus, there's no discoloration like a spot weld would do. It's got me stumped. It's not gonna happen soon, but I'm just wondering because the door jambs and under hood areas will be the first places that I repaint.