hmmm good ?. ive never had a convertible so please correct me if im wrong. i dont think you can tint plastic...at least tint it and have it stay on for long. i think your only option is to either change to a glass rear window then tint or there may posibly be company that makes tinted windows with the tint internal to the window...i think thats the best way to say it. you can always just sprey paint it black on the inside....

ive got a next door neighbor that has a tinted convertable ill find out for you.
j

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2004 mustang gt
Update: JLT CAI, SLP LM2 catback,
Parts in the basement : To much to list. heres a hint..it involves a watts link and turbos.