Gasket remover is the best way to get the powder coat off, other than blasting. I have never heard of any adverse affects from welding fumes though, and we have welded and smoked it off a few times. And, HOTFR8 is right about having to get the entire piece stripped and re PC'd to look good, only other option is getting it paint matched and using touch up paint in the area as long as it the powder coat doesn't have any neon pigment in it, it will fairly easy to match and blend.