From what I understand you can't really dye rubber nor does paint work well since it usually cracks. The only good way to color rubber is to dye the rubber as its being molded. I haven't tried it but I have seen a few guys use rit dye on rubber by boiling water, adding dye to the water then submerging the part for 5 minutes or so. Supposedly this allows the dye to penetrate the rubber. Also it won't lighten colors, you can only go darker.
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