Quoted from Who-Dey:The wooden playfield is what dimples, not the clear coat. What exactly are you getting at anyway? You got me very confused........Maybe im not understanding what you are trying to say or something?
Dude a good clear coat can TOTALLY protect your playfield from almost all dimpling and surface scratches. First off it's the wood and lack of crappy factory clear that's dimpling together creating the craters. In the past acrylic like Polycrylic was too hard for pfs and cracked but now there are a ton of synthetic systems designed for all applications from water tanks to automotive use. Water based acrylics don't yellow over time and when applied liberally to a pf if it gets some surface scratches in the future you can either just buff them out with rubbing compound or sand it down with 2k grit and recoat! I fell like it's been historically, Varnish first used as a clear coat system, then Lacquer, Varathane, and now "Automotive Grade" but with all the different manufactures out there you have to search for one that will work with the high impacts from a pinball. Search for SM2K here on pinside, it's a 2+ year ols thread with nothing but stellar reviews...and nobody complaining of imperfections in the clear after hundreds of plays!