TS-13 on clear styrene?

Aahh, NO. Do not spray a clear coat over the car with the window glass attached. I made this mistake with my 1st WRC car - Tamiya's '98 Monte Impreza - & all the clear bits looked like Colin had driven through a sandstorm. If you wash clean the window glass before decalling, you shouldn't have any probs with adhesion. I never have - & I've built about 2 dozen rally cars so far.

Thanks for the info and suggestions

Never spray any clear coat on clear styrenes. Use Future instead to seal the decal on clear parts.

If I may suggest, attach the clear parts last after the body has been painted & clear coated.

It can be done, however I would not advice it since it's rather tricky.  The diffuculty lies in the fact that you clearcoat has to be perfectly even otherwise you will get destortion when looking through that window.