- Joined
- Apr 19, 2012
- Threads
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- 99
Just a tip, but USG makes "icing" and it is excellent for finish filling, is "thinner than bondo" but air bubbles could also be from too much hardener or pressing to firmly when applying. Get the icing it will make your life a whole bunch simpler

I have similar bits of rust repair to tackle once the weather gets better here and will use your work as an inspiration to get 'er done! 