Quoted from Schwaggs:

Just placed an order for some of the pens from Amazon to try on one of my Firepowers with cupped inserts. Going to do a "redneck" playfield restore:
1) Clean the entire playfield with wax remover including using a toothbrush to remove wax buildup in the crack around the inserts.
2) Level the raised and lowered inserts and glue in place with epoxy.
3) Wick some thin, slow curing epoxy into the crack around the insert, let cure.
4) Use some 400 wet-dry sandpaper on the insert to remove gloss and give the resin something to stick to. Be careful to not sand away the lettering on the insert (hopefully).
5) Flow the whole insert level with the UV resin.
6) Polish and wax entire playfield.
7) Re-assemble playfield and enjoy.
Thoughts?