Painting a repainted car?

I have used TCP Global out of Ca. (along with the local PPG store.) They have a Color Library that can match anything. I have used their primers and are OK , but I admit I prefer Southern Polyurethanes the best.
You can buy a cheap palm sander at HF and some 80 grit, it is not for stripping but can work somewhat but will not strip like 80 grit on a DA. . Paint stripper has gone the way of the EPA and costs half as much as it used to, and I am told works 10 time less! I have not used the new formular. Yes an adequate compressor is not cheap.
Yes a DA will uses a lot of air!