Tinting tail lights
I wouldn't go any lower than 50% with window tint, since it blocks out light in BOTH directions, it would significantly decrease your brake light visibility.
Just get some VHT Nightshade. It works better, won't crack or peel, and it's actually designed to black out lights without significantly reducing their brightness.

Then remove your tailights, clean them well, and paint them (somewhere well ventilated). I did 7 coats on mine, waiting a couple hours in between coats. They look gloss black, but the light has no problem shining through. Looks way better than covers. Make sure to clear coat or they will fade/come off over time.
Niteshades run you about $8-10 per can depending on where you get it, and of course Duplicolor Clear runs you about $6 or so per can at any Auto Parts store, some 2000 Grit Wet/Dry sandpaper and your good to go! Optional buffing can be done to achieve high gloss shine with a good polishing compound.
Heres some of mine:

Yes I know my car was filthy due to it sitting for a few weeks

And at night...no problems seeing the light shine through:



And I have all of my lenses (with the obvious exception of Headlights/Fog Lights) done with Niteshades!
-Justin
http://www.superbrightleds.com/tail-brake-turn.html
I get all of my LED's from them, here are some shots of my interior lighting that I got from them:



-Justin
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2Fast - I did the speedo LED conversion on a friends car, looks sick. With those reverse LEDs, can you still see well enough to maneuver in a dark place? (practicality vs looks)
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Actually my speedo is a Reverse EL Glow Gauge, and I love it! The Reverse LED's are actually bright as ****, and I have NO problems with seeing in dark places....so it kinda works as both factors in practicality and looks!

Then remove your tailights, clean them well, and paint them (somewhere well ventilated). I did 7 coats on mine, waiting a couple hours in between coats. They look gloss black, but the light has no problem shining through. Looks way better than covers. Make sure to clear coat or they will fade/come off over time.

naper, after doing your tailights, buff them a little before clearing them (if you have a buffer). they'll come out with a high gloss mirror finish if you take your time
naper, after doing your tailights, buff them a little before clearing them (if you have a buffer). they'll come out with a high gloss mirror finish if you take your time



