It might stick for a day or two or maybe even a month, but in the case of the head/tail lights, if its laid on the outside (and if the headlights were glass)it would scratch/nick and look horrible in a week. Tail lights are typically sprayed, I think Torque did it to his old E34 if I remember correctly. The spray tint on the tails might last 6 months or so. The plastic in the back window is flexible and the tint wont hold on anything flexible.
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