Quoted from razorsedge:6-12 months apparently. ... Longer to be safe. Cant remember where I read that, but it was given advice. (Mirco)
There is no possible way these manufacturers are allowing their new releases to cure for anywhere near this amount of time.
It should not take this long no matter what. Prior to GB, does anyone really think Stern was sitting on playfields for the next hotness for 6-12 months before assembling and selling them?
I have cleared a few older games with a rather generic PPG Omni clear, not even the one suggested by Vid, and they do not fail the thumb nail test after 2 weeks. One game is part of a project that isn't playable yet, but the other game has a few hundred plays and is doing just fine.
There are products out there that will protect the way we expect without warping and chipping. These manufacturers need to get this figured out, even if it's a few pennies more a game. The playfield is the most important part of the game.