Do you mean the stuff that comes in a spray can? If you want to tint your lights, i would suggest trying a modern day (and reversable) option which is the tinted film. Its kind of like window tint film which is fitted to outside of your lights to darken their appearance. It can be heated and shaped so that it follows the contour of the shape of the lights, is nice and shiny (unlike the aerosol stuff which is dull) and can be removed if required.
Lamin-x Protective Films - Protect with Style
Lamin-x Precut Tail Light Kit Installation - YouTube
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