I'm going to be shaving the bumpers for a project car that I am building. I have never modified or built something that was eventually going to be chromed and was wondering if there is any important tips that some of you can give me. Some of my concerns before starting this project is 1) is regular mild steel ok for use as filler metal, 2) is there certain methods of grinder or certain abraisives that I should or should not use 3) what kind of condition should the final preped be before I send it to the chromer or does the plating process help to fill in minor scratchs and pin holes. I plan on practicing on some junk bumpers before I do the good ones.