FWIW I have a clear coated WPC playfield that was CC'd over some mylar. (Spot mylar not full playfield). This was done by Bill Davis, years ago, and he knew what he was doing from what I hear. Personally I do not have that experience (cc'ing) to offer any insight though.

I would think that you do not need to cc your pf after laying on of these down. I would hit up vid1900 and see what he has to say.
Read this incorrectly. We all know that if you cc you will have dimples as for PET-G, I do not know never seen one after a couple months of play.

I just bought a eight ball that had the overlay done and had the playfield protector also. The only bad thing I'm having is that the ball will skip over the roll over if it goes fast as there is a void in the plastic on each side of the roll over. I even trimmed two inches below the roll over and didn't help. I may try a couple more inches off after I put a new clear roll over in. I also checked the contact and that is spaced close as I can get it. Other than that it works great. I have the playfield protectors on Taxi and whirlwind for a couple of years now that they still look good. If you wait a little bit I think Hardtop is going to make one for eight ball. I've done space shuttle and firepower that's the way to go!

I have a protector on my Atlantis and it is great. No issues. I vote for the overlay