Paint Prep

[xj4wheeling]

Hi I was thinking of using your paint shop system to repaint my 1994 Cherokee. My question is the existing factory paint looks to be fading off in spots on hood,roof and fiberglass parts right down to primer this seams to be common problem on Cherokee's do I just sand and prime bad spots and feather in to good paint scuff hole car then prime and paint? Will the old paint
keep deteriorating under the new paint and ruin the paint job? any advice or tips would be appreciated. Thanks