Fun with rubber cement - part one.
There are two types of Mylar Pop Bumper Playfield Protectors that you can buy to reduce playfield wear around a pop bumper. Each has it's issues.
Non-Sticky - These 'float' above the playfield. Dirt and grit can get under the Mylar, causing wear. Not the best solution.
Sticky - These are attached to the playfield with sticky glue. This solves the problem of gunk getting under the Mylar, but can be problematic if you ever have to remove them. Removing the Mylar protectors can often remove some of the playfield ink.
I have experimented with non-sticky Mylar playfield protectors and rubber cement. So far, the results have been good, but I don't have enough play on them to determine if this is a better solution. Also, I don't know if rubber cement will get hard over time or stay soft.
With this in mind and, here is how I do it.
I have tested Elmer's CraftBond Rubber Cement and found that it hasn't damaged the playfield clear coating on a Bally Double-Up and a Bally Wizard!, but you may want to test the rubber cement is an inconspicuous spot before you proceed.
I thoroughly cleaned the playfield under and next to the pop bumper(s). I put a thick coat of the rubber cement on both the underside of the Mylar and the playfield. I put the Mylar on the playfield. With my thumb and fingers, I press down on the middle of the Mylar and move them to the edge of the Mylar to squeeze out any bubbles and excess rubber cement.
Of course, you will want to touch-up the area under the pop bumper before you put the Mylar on, if you want! The good news is that you can put paint and waterslide decals under the Mylar and they will not be damaged during play.