local speed shops either carry it or can usually order it, the brand is VHT. i have a can of it sitting right here. i did my tail lights, 4 coats + clearcoat, light still comes through, but i put brighter bulbs in it just to be safe. i dont think ive ever seen blacked out altezzas though
the right side is what it looks like with no light directly reflecting from it, almost completely black...if you look at the left tail light, imagine yours looking like that, except instead of red you see clear/silver. probably anyway