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i have a question, i have gone through a disk grinder attachment, and a wire brush and some of the paint is EXTREMELY hard to get off. some parts of the car is down to the metal, but a good portion of it stil needs to be sanded down to bare metal. do i really need to go all the way down to the metal in order to paint it?



Nope, but since you are down to bare metal in some spots then you really should continue until it is all down to the bare metal. Instead of sanding the hell out of it, you could also use some really strong paint stripper. Just don't use it in an enclosed area with a heater going.