Tint Third Brake Light

I want to tint my third brake light but I just don’t know how. I did some research on different methods to smoked tail lights and it seems there are different methods to do it.
One of the methods is using a spray tint also known as vht nite shades to spray the lights using a rattle can method. The other method is to use vinyl layovers. I’m wondering what method I should use and how to use it.
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