I have some ball dimples in my Atlantis playfield. I sprayed the playfield with automotive clear about a year ago but just got done installing it in a restored game with only about 200 plays on it. I only put about a coat and a half of clear on it, you can still see the outlines of all the artwork and the wood grain.
It was hard to image on the angle but the finished was perfect when I was done spraying it and installed it. Looking at the pictures that looks like fish eyes but it's not as it was perfect when I was done spraying.
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