my NAPA store sells Martin-Senour (Sherwin Williams) and they can match an original color with their light analyzer and come up with a formula to match, but the sample that is needed has to be large enough to get an accurate reading. They suggest auto gas door-sized but have matched smaller samples with decreasing accuracy. Once they establish the formula, they can mix in basecoat/clearcoat or one stage enamel, I believe a 1/2 pint is the smallest they can accurately mix. Some stores can also cram it into an aerosol can, but not many.
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