I used this stuff with great success tinting my tail lights for the first time. heres a write up without pics:
Clean taillights
get some 2000 grit sandpaper and a little bowl of water
start by wetsanding the entire tail light. It will look very dull with a lot of fine scratches in it. it will turn a greyish white color.
dry off all the water
Apply a thin even coat of VHT over the tail light. Make sure its a very light coat and make sure your apply it evenly. do not hold can too close to the taillight because it will run. (If it does run, you can get by if you let it dry and then wetsand the spot)
let this coat dry
now wetsand again with the 2000 grit sandpaper
dry off all the water
Apply your second coat of VHT. This one can be a heavier coat than the first. This may be the last coat you will need depending on how dark you want your tail lights. For those of you who want them like mine, i did 3-4 coats. just repeat the process i explained.
once you have your desired darkness, let it dry and DO NOT wetsand.
Start applying your clear coats. I used Duplicolor auto clear coat. On these coats you just apply and let dry, apply and let dry. I did about 3-4 coats of clear. this is what protects the taillights and gives them more shine.
once you finish, put in a safe spot and let dry 3 hours. I left mine in a garage with a fan going.
once they are dry, take some car wax and polish them up. this will give them even more shine and protect them further.
I would recommend staying with 2 coats of VHT because mine are impossible to see at daytime. at night they are fine and you can't really tell the difference.