To be honest mate, if its for home use I wouldn't bother. Its not going to get any worse with a few plays a day. The wear you speak of sounds like planking, which is a wood defect from the factory. You could clear coat it, or Mylar it but that's a huge Faff for what is never gonna be a rare or desirable game. I used to have a mint spare playfield for it but gave it away!! I think he still has it if you're interested I'll put you in touch.
The game has a fairly shallow Rule set so prob won't hold your interest for too long. Just play it and enjoy it for what it is.
Gaz