Transparent paints

Where can I get the transparent paints for taillights and amber corners.
Thanks

bro go to a local model shop and buy tamiya enamel or acrylic paints x-26 and x-27. If youre painting tail lamps always paint from the inside because it dosent look as effective if you paint from the out side. Cher

use fine tip sharpie's (not ultra fine).

and again, from the inside.

I've used them for just about all my lens' (unless they're large, then per above)