I am just going by what I see our body shop across from us deal with when they have to repair failed bondo work. Again its just how you go about it. When I got my first caprice 10 years ago it had the 7X7 option (dual spot lights) and when I had it painted, the shop i went to said they would take care of all the equipment holes. After a year I found out they used bondo when all the filled areas started coming up/cracking and such.Well I am by no means a body work expert, but anytime Ive used bondo and done it right (some guidance from pop) it never fell apart on me. I have seen some break apart and shit but I would think that using it to plug a small hole over some hardened fiber glass might be ok.
Although if I were you... I would listen to the mechanic, not the financial analyst :icon_thumright: