Honestly, save yourself the trouble and get some JB Weld, a thing of Apple Barrel branded “Country Grey” paint (.99 cents at AC Moore), and a small cutout of Mylar.
-Clean the surrounding area with naphtha/Novus 2, use painters tape to tape off the surrounding area, mix up the JB Weld and fill in the divot (use a putty knife to smooth it out).
-Let the epoxy cure for 24 hours. Then block sand the JB weld down Flush with the rest of the Playfield. Wipe down with naphtha.
-retape everything (since sanding will take the tape off), and using a foam brush, brush on a good hearty coat of the country grey paint. Let dry.
-remove paint. Slap on a piece of Mylar, and I guarantee it’ll be a perfect paint match.
It might sound like a lot of work, but it’s really not. And it’ll permanently fix the problem, and look 10000x better than the stupid green dot or horrendously matches grey sanctum decal. If I remember, I’ll post some before and after pictures of my game. It was *really* bad.