Paint always shrinks up (dying back). Part of the paint you spray is just solvents that make it spray able. That doesn’t stay with the paint, it will slowly leave the paint.
Most of that happens at the time of spraying. The solvents (VOCs) are primarily to make the product spray able, meaning that the droplets of paint can become very small and provide a smoother finish. Their secondary use is to help the paint flow out on the sprayed surface, also provide a smoother finish.
That’s it. Then the remaining solvents will slowly leach out of the paint over the next one to two months. That’s why you don’t want to wax a fresh paint job, you’re sealing up the surface and not allowing the solvents to escape. This will greatly shorten the lifespan of your paint job.
Anyhow, that means you may have an ultra slick paint job when you’re finished painting. Then two days later you can see the places you repaired. The solvents had the paint “swelled up” over the top of the repair. When the solvents say adios, you’re left with just the basically plastic film that sucks tight to the panel. Including any repairs done to it.
This isn’t really a big deal though. You can color sand and buff the area smooth relatively easy.
Even after painting for forty years, this still happens to me. Trust me, light color sanding with 1500-2000grit sandpaper and a buffing will make this all go away.
Sorry I missed all the stuff about bubbles. Kevin is an excellent tech and he’s right, strip it down. Even if you can make them supposedly “go away” for a short period of time, they’ll come back and bite you in the butt.
The bubbles are simply showing you that there is zero adhesion between one layer to the next. Periodically I’ll have bubbles like that after i have primered a bodymans work. It’s mainly noticeable after a bake cycle in the booth. Usually at this stage I’m gong to my foreman and explaining to him how the gd body man doesn‘t know wtf he’s doing and needs to pull his butt out of his backside.
