Hey Steve, I use a couple of coats of Johnsons multi surface floor wax. Its not widely available, but most good irnmongers or builders merchants seem to stock it. Used to be called Klear years ago. Popular with the airfix brigade as an intercoat to seal paintwork for waterslide decals. Water-like consistency and goes through an airbrush superbly. Probably not i.c. fuel-proof, but certainly waterproof. Might be worth a try.
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Joo's Paint Kingmax Servos Optipower Yokomo
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