Oz, enamel over lacquer has been done since the 70's.Its good. Not as good as urethane, but way safer for you. Its the lacquer over enamel that ya CANT do. I used to sell all my car models on ebay, and ALL were either finger-nail polish painted(lacquer) or base coat/clear urethane. I got away from spraying urethanes inmy house, and am no longer in the automotive bizz, so I only spray what I can buy in a hardware store. That brings up an idea. Finger nail polish is lacquer. I used to paint models with an airbrush. I bottle did it. If ya find the right color, buy a dozen, and mix it and spray out of a detailing gun. Sometimes called a jamb gun, as that is what we painted door jambs with. Low pressure,low volume,low overspray. Clear anyway ya want. JMHO Al