Tiny pin holes in weld

You can put on a skim coat of "All Metal" filler and call it good. But thats the easy way out. Although that stuff is rust and moisture proof, I think it would be fine if the filler was topcoated with a good primer and then paint. I used it on the seam of some of my welds even though I didnt see any pinholes, it was more of a just-in-case kinda thing. I would not use regular filler unless its over the All-Metal stuff.