Plasti dip is one way to do it, but it really depends on what you're going for. I chose to go with a film rather than the dip, for I didn't want a matte look to my tails; to me it just doesn't look right...even with the glossifier. Then again, to each their own. VHT Night Shades is another route you could take, but they warn consumers that you will never be able to get it back to a "like it was" state if it's removed.
I actually just purchased a 50% film for my fogs, headlights and tails from
HeadlightArmor Clear, HID Blue, Racing Yellow, and Smoke Light kits - Home a few hours ago. Had XPEL on mine for a while but it wasn't applied all that well so it started to peel.