I am spraying a nitrocellulose lacquer finish. Tiny bubbles are appearing, and I can’t figure out what is causing the problem. I've never had this problem before, though I haven’t had a great lot of experience. I have an air compressor that has an oil free pump design. I do not have any water traps or filters though, could this be my problem? I also need to add that my spraying conditions are not the greatest. The temp when I was having this trouble was about 84, the humidity about 53%. I have a window unit air conditioner that cools my shop but I can’t run it while I am spraying, because I don’t have a spray booth. I guess I should look into getting one, but anyway if any one knows the answer to my problem I would appreciate a reply.