In regards to the "wet spots" it's nothing to worry about in regards to any moisture actually forming on your game. This is light refracting at different angles in regards to the playfield surface, clear coat and the protector. Here's a pic from a guy that tried glueing 2 pieces of lexan together to get a thicker piece. Because there is no gap in the "wet spot" areas of contact you get light refracting at different angles giving what our vision perceives as moisture on the surfaces. This is the same as areas of the protector that are laying perfectly flat against the clear coat on a playfield. No amount of waxing, blowing compressed air or rubbing a magic lamp will change the out come of how a protector looks once it has settled into a final resting position.

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durgee7 what you are seeing is small impacts of airballs chipping away at the playfield paint and any residual wax or residue that was rubbed into it at the impact point. This is what these are designed for, especially on older games. Each one of those white dots would eventually lead to even more playfield wear and eventually bald spots without the protector in place. I only get this white dust on my old games, all of the modern games I make protectors for never see any of this after months in an arcade enviroment.