I removed the backglass from my Surf Champ and noticed remnants of something sticking to the backbox - seems like it must have been thin beerseal or something to protect the backglass from rubbing against the backbox. It's now almost completely flattened, and there are very few remnants of it on the backglass - notably exception being around the game counter.
I'm reaching out to bgresto to have my glass restored but am wondering what, if anything, I should put on the backbox - and where I should put it - to protect the glass. Can anyone tell me what Gottlieb used? And what does everyone use now?