some ppl use over reduced black, sprayed out of a spray gun, some pp use tint, some use a vinyl mask. however, more importantly, prepare to be lit up for asking this question lol
Oh dude, it's ok if the bike leaks out light from the front and back. You don't have to seal it off so it won't escape. There's plenty more light where it's coming from, you don't have to capture it all inside the bike, it won't run out of light if you let it out.
See the way it works is after the sun goes down its very hard to see. Manufacturers of all kinds of motor vehicles have been putting lights on the front so you can see where you're going and lights on the rear so you don't get rear ended. Pretty cool idea.
Also during the day since you can already see where you're going because the sun is out the lights on the bike help prevent other people from running into you.
Vht niteshades for tail light tint. Use 2000 grit sandpaper to take off the clear on your tail lights and spray on as dark as you want. Use gasoline to remove if you get to much.
Do not tint your fucking headlight, even with hids you wont be able to see at night out of it.
use vht niteshades you can buy it at any oreileys or advanced auto parts. not autozone though. i do headlight modifications(halos, leds, painting chrome to black chrome) I tint tail lights and signals. use 2000 grit sandpaper for like 10 seconds over the whole thing just so the stuff will stick. and then spray on the vht niteshades. if you dont believe me look up on facebook. travis lighting accessories. its my business.