I agree with David. This best solution is a very thin spray with an auto enamel ( probably black if it's s SWAT vehicle) then later repaint over top with your preferred paint. Ignore all offers of rubberized peel-off paints or water soluble latexes. They just don't work on our flat paints. Also beware of the on-set painters who love to age canvas with a sprayer full of diluted brown latex paint (" it will just wash off because we dilute it with dish soap": phooey!).
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