I don't think people get it so I'm going to make a bold statement here, this is the product I am using to clear pfs and really believe in it. The way most people are clearing pfs now (CPR, Micro, Stern, Diamondplate etc.) is by using a 2 part Urethane automotive grade clear coat which is mainly used in the automotive field. Urethane can be either too soft or too hard but not in between, it's great for the sweeping curves of a cars body but not ideal for flat surfaces. There's thousands different manufactures of 2 part or 2 pac Urethane clear coat systems but I have not seen one yet that will either crack and chip because it's too hard or dimple and wear fast because its too soft. As a professional mechanic I saw countless dealers (BMW, Lincoln, Porsche) were installing bug deflector kits (basically mylar) to protect and warranty their Urethane clear coat finishes. Varathane, Polycrylic, Lacquer, Clear Enamel, Varnish were all used in the past and are not much better, really I think the Varnish holds up the best as you can tell from em Gottlieb pfs. Using pure acrylic like Polycrylic has been the only way in the past to protect against all wear but is too brittle and cracks under extreme stress. You can see all the clear coat repair kits floating out there for Urethane 2 part jobs and that only further proves my point, if you can't drill into your clear coat without cracking what do you expect to happen when a wild ball hits your rail or slams into a open area on the pf.
This is why I am such a Spraymax fan they have successfully blended soft resins with tough acrylics, literally the best of both worlds. This is the same recipe as bulletproof glass essentially. When applied liberally I use about 12 coats it WILL NOT DIMPLE from a ball drop up to 6 feet, anything over 6 feet it will start to leave a mark, which is what you want instead of the clear coat cracking. Spraymax is also stronger on large surfaces and explicitly states that. I don't believe there's any action in pinball that could generate the same level of force as dropping a ball from 6 feet. This product will not wear down and will protect the playfield art and topcoat finish for a lifetime, not 5 years or even 20 a lifetime 80-100 years! Here you can see some examples of the elastic qualities of SM2K sprayed out onto this paper plate.
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