I've not yet experimented with an airbrush, so have brushed the first coat on today, it looks like it will need a further coat to cover it reasonably. Will let you know how it goes.
Regards
Chris

You can paint laquer over enamel ,but I would suggest going back to the base wood.Use a primer sealer to seal all the other paints out then go from there.I know what your talking about,happened to me till I figured out how to deal with it.Ive even gone as far as to brush on a couple layers of 30min epoxy deluted 50% with denatured alcohol to use as a sealer then start my primers to get smooth.Do Not Paint Enamel over Laquer,the enamel takes a long time to dry which attacks the under layment of any paint/primer.This is why the bubbles form under the paint you just put on