For what it's worth, here is what I did with mine.

I have a rather worn playfield on my Bally Bon Voyage. We love playing it. The playfield had been Naphtha'd, Novus 2'd and waxed about 1.5 years ago. I waxed regularly afterwards. I purchased a protector. Before install, I vacuumed the playfield, did some minor touch-ups around inserts then waxed it one last time. Then I installed the protector and waxed the protector. I was happy with the look, the play is good and now I do not have to worry about my playfield disintegrating as we play. My plan is to wax the protector and change the ball as needed.

Just the cap. Flippers need to come out.

It took an evening to do mine.

I was doing a full flipper rebuild too (the night before).

I asked, but no response yet.

Exactly!