This is from a guy over on the Viper boards. I thought I would share it here.
OK, I have a '94 with ~95K miles that stays outside 100% of the time in upstate NY since 1998. I am not complaining, nor do I care what anyone thinks about how I treat the car. It is my daily driver (which I will start to term "enjoyed daily") and I am sharing this information merely so that the current owner of my next '94 keeps it in good shape while I use this one up.
With that disclaimer out of the way, I wanted to show what happens to the clearcoat. I have a friend with a black '94 that spent the first half of it's life in a garage and most of the second half under a cover, and it is starting the same things. So I do not think it is related to sun exposure, only time.
Bubbles in the paint start when the clearcoat seems to lift off the paint layer. After they get larger you can pick at it, or the layer that has lifted off cracks and breaks away (like popping a blister.) I put the tack in the picture so you get an idea of the size.
They keep getting bigger.
On the hood the paint seems to shrink and split. The white underneath might be the primer?
And of course, they grow, too.
On the door the lighter swirls are "in" the paint and haven't changed the surface (yet.) So while it looks odd, you cannot feel it.
I don't have an explanation. The bubbles are mostly on the rear of the car, the split paint only on the hood, and the swirls only on one door.
I guess something I'd like to add....
When at the oil company, part of testing a new gasoline was to spill it on paint panels every day. Each metal plate was painted with various OEM colors and left outside 24/7. After a long time they were cleaned up to look for staining, softening of the paint, etc, etc. Never saw anything "bad" happen that wasn't repaired by the clean-up. So I have a fairly high level of respect for paints and polymers and my technical bias is towards a "good" paint applied to a "less well understood" surface. In several engineering articles it was explained that Dodge had issues with the hood and not until Amoco Chemicals helped them out did they get a material+mold+temperature that resulted in hoods that lined up with the rest of the car. One reason it cost $13,000, I guess.
Any Painters here can explain what you see on this car??????