Don't wax it!! There's absolutely no point to waxing your playfield if you're laying a protector down. You'll run the risk of unsightly "wet" spots appearing between the protector and the playfield caused by the wax. It's called mottling. Naphtha is used to safely clean and remove the wax so this doesn't happen. I have protectors on my newer Sterns and love them. Much easier to install/remove on older pins. Majority of users are very pleased with playfield protectors.