I used PPG single stage paint for all the interior. I painted only the forward part of the cabin top - and prep for that was a real PITA. For the rear cabin top I made a headliner using a marine grade foam back liner.
If I had to do it all over again I'd still paint the front part like the rest of the interior, but for the rear I'd go with one of the bed liner type paints. A neighbor finished his Lancair 4 cabin top with this and it came out great.
Carl