I have just started shaving the bolts on a repop bumper I got back in december. In total there is 8 bolts. So far, all I have done it tack the bolts in place on the back side of the bumper. I have carefully ground the head off one of the bolts, and used my mig welder to fill in any gaps that were around the shank and the bumper on the front side. I am now fighting two problems.

Problem #1: I now have a 2-3" low spot were the bolt hole was. Its not severe, but since I'm going to have the bumper rechromed when I'm done, it would be noticeable, especially after I do all eight of them. I think this is caused by a cobination of LIGHT grinding (with 120 grit rol loc) and wraping from welding. Any advice on how to do the other seven without these problems? Any advice on how to fix the low spot that I've already created? It's probably only 1/32 - 1/16 low...

Problem #2: I keep chasing around a very light "valley" and other pinholes that appear on the edge of my welds. I thow a weld over the top of one low spot, and it just creates a low spot in a different place. Again, it woldn't be a problem if I wasn't going to send this stuff to chrome when I was done. Any advice on what to do to fix this?