Its definately fish eyes which is mostly caused by silicone, oil & water, It can also be caused from leaving wax and grease remover on too long, I don't know why its coming out a few hours later but i did a paint job where it came out when we finished the car (paint place was selling thinned paint and we werent aware so my mate mixed it up with thinners, It still had a good consistency), Do you have a water seperator on the compressor?
Thats all i can say as its not my field, Good luck.