Another autobody question

[Argeo]

Actually 2.

As I had mentioned in an earlier post, after I mig welded some small pieces of 18 gauge sheet metal onto my fender, I noticed some pin holes in my weld. Can those be filled with solder (not sure spelling)? Someone had said to fill with bondo with fiberglass which I can do. I was just wondering if solder would work. Is it more likely to fail than bondo? Also, I have a two part putty that POR sells for filling rot holes. Any preference on solder, bondo or POR putty for my pin holes. Also, I went to the weld supply store near me and the guy didn't sell anything that was used for filling pin holes.

Second, I believe I sanded my fender too much. In two shots there are nickel size light blue spots. Should I just skim coat with bondo and forget about or is there someting else i should do? I will be lightly bondo the area anyways to smooth over my weld job. I got the rot off the fender so all is not bad.

[RickM]

IMO, modern "Bondo" will be fine for the pin holes. Therer's no need to go to the trouble of solder or fiberglass. I think there were a few spot on suggestions offered in you last thread.

Blue spots tell me there was excessive heat. Why do you need bondo? Did you sand the entire fender?

[Argeo]

Thanks Rick.

Yes there were some good suggestion in the other one which led me to try and find that welding paste someone had mentioned. Unfortunately I couldn't find it and the solder idea popped into my head last night.

I guess I will just bondo over my weld and call it a day. Rot be gone.

Thanks again for your help.

David