I guess I don't understand why you want to gloss the cockpit area. Do you mean the canopy? I generally do not gloss that either unless there are flaws and I have to sand and polish the plastic.
Particularly in older canopy materials on full-size aircraft, the materials used did not retain the nice, transparent finish very long, and didn't continue to look like glass. It weathered rapidlly. So as long as the kit canopy looked reasonable, I just mask off the transparent areas and paint the frame.
In fact, I think it seems odd to see a heavily weathered aircraft model with a super clean, super gloss canopy.