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A little cosmetic bondo is ok.DO NOT GRIND THE WELDS
unless you want to powder coat someday then you'll play hell getting it all out even with sand blasting it. I have seen this first hand, not on one of my rails but a close friend. and what's wrong with knocking the edge off a weld and/or laying a small pass back over it?
Grinding welds is bad practice. Carl is right.