It looks like your playfield has a lot of the same wear spots as mine: through the Welcome! at the top, where the ball lands when ejected from the center kicker of the three holes below the Welcome!, where the ball lands on the upper playfield when kicked up from the main, and the four spots in the lower playfield where the ball lands-- those are the main ones on mine. Have you given any thought to how to protect the playfield after repairing it?