[SNIFNFUMES]

Hello all,
I have a 66 Caddy that had a vinyl roof which upon removal had some pretty major rust (surface, pits, holes) on the sail panels. I've cleaned up the majority of the rust with a wire wheel and some naval jelly and have welded the holes. My next step was to apply some tiger hair.
My question is that in some areas there is still some rust that just doesn't seem to want to come out of the pits. I know ideally I should cut it out and fabricate a patch panel, but how long do you guys think it'll last if I went ahead and fiberglassed the whole sail panel?

Thanks in advance for any suggestions.

[roger1]

Keep putting Naval Jelly on the pits and power wire brush them after washing off. After several iterations of the this, you will get all of that black rust out of the pits.
Reverse the direction of wire brush wheel often so the bristles don't bend in one direction. Then check the deep pits with an awl to make sure they haven't turned into small holes. Weld any small holes up with your Mig and weld in patches for any larger holes.

Apply an epoxy primer first, sand it and then use filler. I like to use the Evercoat fiberglass filler instead of the kitty hair.