Well.....crap. I had two cans of clear left, and decided I'd use both to try and slather it on thick and hopefully be done with it. I sanded and cleanded the playfield before applying, but unfortunately, I'm not happy with the results. There wasn't enough clear to completely level the inserts. To make matters worse - on the last can I got some condensation that dripped from the spray nozzle onto the playfield.
I tried to see if I could polish it all out - started with 400 grit to level, then went to 1000, then 1500 and finally 2000 before starting with the rubbing compound, polishing compound, etc. After working on it for a while, I could tell it just wasn't going to come out nice enough to warrant the effort. I don't want to spend another 5+ hours polishing this playfield to a nice, clear shine if the inserts are not completely level, and there are other imperfections. So, I decided to order some more clear. My goal is to get everything level so I can put down a thick enough coat of clear that will not require hours and hours of sanding and polishing to get a smooth clear finish. I've seen it. If I can get everything level and then apply enough clear, I may be able to just let it dry and be done with it.
The good news is that my Pascal PI 1x4 board has arrived. Now I can finish re-pinning all the connectors, and get most everything else cleaned up and ready to go.