question for proper painters
I do my own spraying and do reasonable job but not a pro
I have a LC I bought 10 years back and had been painted couple of years before in Protec 604 2 pack
but they didn't take out windscreens or do inside / under boot / bonnet
so I had paint matched and did all that
then couple of years ago blisters appeared in the paint in some spots, not my painting
I thought rust bubbles so left for later
then last week thought time to fix as am selling the car, cleaned back the blistered paint
no rust, black primer still visible
my question is what causes the blisters?,
I noticed some on my GTR the other day as well
acrylic paint, I did all the prep work but a professional spray painter friend offered to spray, no cost