From Detailed Image:
If you want your rubber trim to look black and stay black then you need the Rubber Black dye. Just apply the dye and you will see dark rubber that really looks like new again. Since the rubber trim is usually right near paint it helps distinguish the rubber and separate it from the paint. This step really sets the paint off and separates the common detailer from the professional. It’s very easy to use, just apply the product to a sponge, cloth or other soft material and wipe it on the rubber. Don’t worry about it if it hits the paint, it’s very forgiving, just wipe it off with a clean cloth and it leaves no residue behind. Don’t let your trim pieces be an eye soar, treat them quickly and easily with the Leatherique Rubber Black.
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Leatherique Rubber Black Dye 16oz