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Re: Is undercoating good or bad ?
I think your guy has it wrong the undercoating prevents the moisture getting next to the metal. But with that being said if you put it on and weld close to it it can/will melt away from that area. If you leave a big portion untreated so not to get burned what would be the use in some if not all? My ideas I will submit is to use weld through primer then you want extend it out past the areas to be welded then undercoat the parts away from the heat. Or treat the entire panel with weld through. Any way you go is a better than what they had as in nothing.
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