I assume you are going for the tinted look and not all-red like mine. I beleive Testors does make a translucent black and not the opaque black like what you have. The can should specify whether of not it is the see through type of paint. If not, just ask a salesperson at the hobby shop.
I would keep the clear though, as the Testors will fade over time without it.
I found the paint you need at http://www.ubhobbies.com/testorspaint/ It is called Transparent Black Window tint. Its really made for making tinted windows on model cars but it works just as well for tailights and stuff.
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