Why not do your touch ups and take the playfield to an auto repair place and have them clear it? You have fully stripped the top of the playfield so this wouldn't be a problem.
If you decide to do this make sure that you prepsol the playfield before you take it.
Clearing the playfield will give it a nice shine and give you the results that I think your are looking for in this restro.
If it helps with your decision my HH had mylar on it when I got it, but there was a lot of lifting along the edges of the playfield window. I have since removed the mylar and I'm planing on clearing it.
Believe me, I've gone over it a million times on nearly all of my machines. My spray painter - who is going to paint the cabinet and has agreed to repair it, get it level and clear in between each coat has agreed to this no dramas. If it gets stuffed, easy fix. No such luck with a playfield. From reading and research generally its one thin coat, let it set, block it then at least another two or so thin coats as well. Given its not baked in the oven. He isn't keen on doing a playfield because of the risks.
I guess the thing is, as long as your careful laying down the mylar, you can get a nice shine on it without the risk.
