thanks, Tony. I was kinda wondering about the lacquer thing. Good point about the weight factor too. I'm mainly just thinking of some highlights.Any water or oil based paint will be safe. Avoid anything with Lacquer thinner in it. And test a piece of the foam if using oil based thinned with Mineral Spirits.
And I would use an airbrush. They give the best results. But you can also use an aerosol can or a brush as well, it just doesn't look at good IMO. And be careful how much you put down, it does add a pretty good amount of weight.