Tinted plastic

Presuming for a visor. If that's the case you might want to look some of the visor threads.
The common approach tends to be 1 of a couple approaches.
1 - Clear plastic + window tint film (optionally + airbrush chrome
2 - Vacuum formed clear, then dyed, then sprayed
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Take a look in the Tutorial Index. Scroll down to "Visors" to see tutorials on the wide variety of options you have that range from inexpensive visor films to making and dyeing you own custom visors:
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