Can I convert the rust out before I weld in the patch panels? Should I grind it out and hit it with a weld thru primer? I just am not sure what the best way to avoid toxic fumes. I am doing floor and quarter panels on a early Mustang and was thinking of the biggest pieces possible to use. Can you also tell where to weld or attach body support so I keep the car aligned. Right now I need a trunk, floor, cowl, quarter panel and roof attack plans. I watch your shows all the time but not sure where paintucation is. Thanks for any help you can give.