Hello PhotoForum Members: I thought someone on this list may be able to help me out. I am varnishing 16 X 20 handcolored photographs and haven't found a way to eliminate air bubbles. I've used several kinds of brushes - including brushes with natural and synthetic bristles, foam (the worst) and hake brushes. I've also used Duolac varnish and a water based, clear gloss varnish to see if a different product would make a difference. Any suggestions would be appreciated. Thank you. Marilyn