The following method is what i used to tint my taillights and side indicators.
Things you'll need:
-Various grits of sandpaper *depending on if you have deep scratches or blemishes you want to get rid of get courser ones but don't go past 400 or you'll be giving your tail lights hell.
- VHT Night Shades *a tinting paint made for tinting* lewls
- Various tools to get tail lights out
-Cleaning products
-Clear coat. *i used White knights Non-yellowing acrylic clear Gloss. You can get these from bunnings at around $12 a can, works a real treat*
- masking tape and newspaper
So first step is to remove the tail lights not awfully hard as long as you take all clips off.
Next make sure you mask the plugs and rear side of the light off with masking tape and newspaper.
Clean the tail lights. Now if you have access to cleaning chemicals such as prepsol, trisol, or Wax and grease remover then great but if you don't Windex is your friend
once thats done it should be spankin clean like so

next step is sanding the light down so that the tint can stick on. I had a couple of scratches on the tail lights so i started with 600 then followed it by 1200.
ALWAYS ALWAYS sand the plastic down wet. I sprayed windex onto the taillight and it worked well as it took some of the stronger stickier dirt off the taillight whilst not making the scratches obvious. If you you think you have quite deep scratches make sure you go over the course scratches with lighter grit sandpaper as it may not look too bad when its not cleared but once you clear coat it the scratches come out a lot more obvious.
Heres after sanding and cleaning it again.

Now heres the slightly tricky part.
This Nightshade stuff can make your lights dark REALLY quickly and can cause runs really easily aswell. Also trying to spray nightshades on a cold day wont end up being good as i learnt that this paint is very sensitive to condensation. So don't spray it like you normally do with spray cans because if you do so, you'll end up with a lens that won't let light pass through at all. Stand the taillight up right and spray in a sideways motion making sure that you don't take too long, but you'll be able to tell if its too dark. i did 1 coat then a couple of touch up sprays *very very light though*.
After the night shade has completely dried get your clear and give it a couple of coats. i gave mine 2-3 and they came up like this

It may seem dark at first but once it dries up the clear actually makes the lens a lot more transparent and light certainly does come through.
Now the chances are you might have stuffed up your first go. I stuffed up twice doing my Series 1 lights the first time so if thats the case follow these steps:
-maybe you have sprayed it too dark resulting in a lens that doesn't let light through OR you sprayed it too hard on some points resulting in runs.
-Never try and clean it up as soon as you realise. Even if you think its wet, this stuff has a really weird drying pattern as the whole surface dries in different time intervals so leave it until it is completely dry. approx 20-25mins
-Because this stuff is hard to take off with solvents you need to basically sand everything off. Now before i said don't use anything under 600 but in this case use 120 grit to get all the paint off. Once thats done, follow the same steps as you did with prep. I went 120,400,600,1200 all wet sanding.
-try the spray again
you can use the method for side indicators aswell





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