i just found a pin on craigslist with an overlay on it. it looks fantastic, but does it affect gameplay? would you wax and polish it? how would you go about cleaning it? this is the first i've seen of an overlay used to make a pinball machine's playfield look better. if the gameplay is different or weird that i would think it wouldn't be worth it to make it look better. has anyone heard of this being done or have any experience with this?