Unsupported bondo would not be good for this.
It would work itself loose like a bunch of little wine corks. On the larger
holes, say, over 5/16, I seen pros recommend that you cut a plug and don't
try to fill the entire hole with weld, because too much heat builds up.
I saw a nicely welded firewall on an AD though, where the guy told me he
didn't cut any plugs, so use your own discretion. Smooth the welds with a
flap disc and finish with a sander, finishing with light bondo or just
sandable primer.
Regards,
Grant S.
54 3100 (mostly all there)
54 3100 (mostly not there)
55 1st 3100 (mostly rust)
Los Angeles, CA
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