So based on the comments so far, a 90's SS car should be fine to coat if the wipe from a product like Eraser doesn't dull the paint? I'm assuming this would be the case even if a bit older as well.
I'll try a small spot with Eraser and see if it dulls the paint or not to determine if it's coatable or not.
I'll try a small spot with Eraser and see if it dulls the paint or not to determine if it's coatable or not.