On Saturday, December 7, 2019 at 4:24:07 PM UTC-7, soaringjac wrote:
Will bondo work?

Bondo might work, but is brittle. You might want to look at an epoxy based filler that would be more flexible in the long run. AEROPOXY LIGHT from Spruce would likely be a better choice. For a few small holes you could try something like JB Weld. If you have some cotton flock, I would mix some with JB Weld and use that. It would provide an epoxy base with the structural strength of fiber to minimize cracking.