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By the way, knowing that both sides of the metal are clean, what would be your concerns if using fiberglass, or something similar, as a backing to support a skim of filler on the outside? Do you think the filler might crack or break at the interface, causing the paint to crack? These are small holes, and generally the metal without holes is in decent shape.

Thanks.

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Yep, I think that at some point the filler will crack and the metal will start rusting again. Clean or not, metal that has pitted is 10x more likely to rust than metal that hasn't been rusted/pitted. Filler isn't meant for this kind of repair and fiberglass is a bandaid. If I ever found fiberglass on the back of a panel, I'd run, not walk away from the car.

Do it once, do it right.


Dave