There was once a product known around the traps as “spray tint” and you could get it from K-Mart. People did there car tail lights with it to make them darker…. if you can still get it, I recommend you try it !
Here is the link for an Australian brand… they call it night shades 🙂 1 can should do about 1000 cars !
http://www.speco.com.au/vht_special.html
