Simple answer to keep the whites white is to back with white. I use matt white plastikote. works well enough. don't forget your paint is going on way thinner than using rattle cans.
You don't want to thin as much as 50/50, and i'm not sure if plain water works ok for thinning? I just use the proper reducers. I mix the paint in the airbush cup personally, normally a few drops of reducer is enough for most paint.
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Yokomo. Nemo Racing
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