Playfield overlay & Auto Clear

In RGP the question about a playfield overlay and auto clear were brought up. The awnser:

Yes you can and should clear coat an overlay if you want it to last. I
personally use clear Bulldog Adhesion Promoter. It is basically a clear
plastic primer. Works great and you should be able to get it at an
automotive body shop supply store. Spray on a couple coats and wet sand with
800 paper before spraying on the automotive clear.