Cadillac Seville “defoliate”

Hello together I’m about to buy a Seville. Jg. 94-97. Have found a cheap, quite well preserved one. Only that this grayy orange/black is foiled. Original color is dark green met. Does anyone have experience with the defoliation? As it looks like, the folation is about 3 years on it. The car itself has Jg 97. Does the folation go off without any problems? Can the paint “come” with such an old car? Could it form rust under it, which you can’t see now? (Bläschen are not visible) Question by the way… Have another 95 in mind. Did there have to be big changes except in the interior? (armatures and center console are different) Thank you! Gruss Martin