Quoted from Elicash:No disrespect to the guy touting his clear coat work - he may be awesome - BUT
I know from experience that more layers of clear during the process is not necessarily better. Many layers of clear can look amazing and “like glass” on an unpopulated playfield. But after a month, a year, or a couple years you will have problems with the clear lifting at posts, playfield edges, and outholes. I know this all too well from experience with a game I bought with an after market clearcoat job.
In Clay Harrell’s ‘This Old Pinball’ videos, he addresses this exact issue and list the same symptoms as potential problems due to umpteen layers of clear. In his tutorial episode he does only 2 coats.
Again- no disrespect to anyone. I just know I got a little burned by this.
No sweat man, your totally right with using something like varathane or even on the factory diamond plate clear coats I've seen the top coats lifting over inserts, cracking, chipping. Its soft stuff and has a hard time bonding to a plastic insert that has been polished and just has no bite.
But this stuff is unlike your traditional clear coats and is mostly comprised of acrylics & resins (what they make bulletproof glass out of) much tougher than any soft 2-part urethane or lacquer. The resins bond it together I'm guessing, its kinda like super-glue meets crushed bulletproof glass. I can assure you as many of them as I've finished blocked sanded down now they get much stronger with more layers. In fact if I don't block sand them within 24 hours of finishing the coat it's like trying to file a rock down with a potato chip wet sanding with 2,000 grit. lol It is already time tested and has been used for over 3 years by hundreds of pinsiders, and I think we've somewhat perfected the application.
Here's the link...
https://pinside.com/pinball/forum/topic/the-spraymax-2k-auto-clear-in-a-can-club