naa koy plano mo palit ug airbrush. i'll be dealing mostly on military model kits. maybe some retouches on my marvel models pud. I've heard that i should go for a double-action airbrush pero mas mahal lang gyud. any suggestions from the experts here or the more experienced painter? should i still use varnish to serve as fixative to the paint and primer before spraying paint? and what type of paint is best suited for military modelling kits that are plastic and marvel action figures(my bullseye galactus series needs some bit of retouching on the gloves and boots area. thanks in advance for the help.