I'd blow a fan up in there.

I don't see the need to put a protector over a cc'd pf. Why are you doing this?

I assume this is a pf from Brunner. He does a great job. No way you will see wear in home use.

I'm confused as to how moisture got under your protector in the first place. did you spill some water?

Had this same thing happen to a Hobbit that was NIB. I bought the protector and put it on. Next day I had what looked like a moisture spot in the middle of the playfield. I tried the hairdryer trick with no luck. I sold the machine in February so there was no solution on my behalf. Curious to see how successful you are at solving this one. I just put a protector on my CC and didn't have anything like this happen. Go figure. P.S. I live in Colorado so the air is real dry here, no humidity issues.

Maybe she's...........alive.

One of those spots is in the middle of an insert. The other spot is along an insert edge. I'm shooting in the dark here, but has some sort of moisture got between the inserts and the insert holes? I would not know how especially since your TOM does not have this problem.

No, it does not really help but is sort looking like if you keep at it the problem may soon disappear.

The clearcoat is breathing.It takes up to 6-8 months for it to settle down.If you do not maintain a set temp in house,say it varies 20 degrees from morning till night and add a moisture change in the air, all of this can add up as an issue if you're going to cover it with a protector. If you continue like this mold will be on its way.
-Mike

Did you try Moisture removal, such as a Damp Rid Type container/bag product inside the Cab?

You have a sealed Environment, that will have moisture.

As mentioned above, it finds a place to condense.

30 days with a product such as above, may solve this.

I don't think you're going to be able to get rid of these spots. My BM66 protector does the same thing. I made the mistake of waxing before I put the protector down. It was pretty bad. The spots kept appearing in the exact same areas which led be to think it could be excess wax. It may just be spots where the protector is laying perfectly flat and there is no air in between those areas. As stated above it may disappear once the CC settles. The areas are not "wet" per say. I think mold worries are very overblown.

Playfield PETG protectors have the same types of conditions as witnessed on translites in backglasses with tempered glass, not related to static electricity. There are three common causes.

1 ) Residues left on the playfield prior to PETG protector installment, and is very easily to overlook.
2 ) Reflective mirror glass effect between the smooth clear coat surface and the PETG protector that is caused by surface tension.
3 ) Condensed moisture particles which permeates through wood surfaces due to environmental temperature variations and humidity levels.
Wood conditions remain porous and still particulate those particles through those surfaces, even on clear coated playfields, edges of playfields, game inserts, and other areas.
In the case of clear coated playfields the moisture remains trapped between both levels meaning the PETG protector acts as vapor barrier.
The aspect that makes it a bit worse to use a protector, as there is not much ability for the wood or surface to "breathe", but the moisture variations pose little threat in climate controlled homes.
You are not going going to get mold, unless the environmental conditions promote this problem.
Keep in mind new manufacturers playfields and freshly clear coated playfields are still "settling", and have moisture contents than 20 year old games. If not properly cured, it can be much higher.

It is quite unnecessary to use a PETG protector over the entirety of a freshly clear coated playfield installed in a game used in a home environment.
The game and playfield will outlive the owner, unless severely neglected.
It is simply a waste of additional money and extra work for the owner to install.

Back in the days when I would make my own playfield plastics, I would sandwich 2 thin sheets of plastics together with a Mylar printed sheet between them.

Sometimes there would be a spot, just like yours, that would form above a lamp.

It looked like it was wet, yet I could wipe it with Naphtha, reassemble, and within a few days it would reappear.

The plastics distributor that I showed it to said that some kind of plasticizers were probably leaching from the plastic.

Once you get her moist you should taste.

This is the same as if you put a real glossy photographic print behind a piece of glass. The areas that are perfectly flat and mating will make a different look (wettish) because it changes the refraction (no air between them). There isn't a solution other than mounting the print away from the glass. In the real world, you can use a matte finish on a print to help or mount a print in a mat to insure there is an air gap between the two surfaces. This stops the look and also protects the print and finish from moisture forming where they touch and ruining the print in the long term.

I think these playfield covers may have some of the same problems over time as photos mounted directly behind glass. Check this link out to see all the things that can go wrong with a print/piece of paper. Note your playfield is just a really thick piece of paper so the wrinkling won't be as pronounced, but the condensation, mildew, sticking art, etc are all real possible concerns.

https://frametek.com/articles/why-paper-art-buckles-in-a-frame/

Playfield protectors suck! Get that off there

Are you sure it's actually moisture? Does it feel wet? If not, I suspect it's the interaction of two clear materials. I think they are called Newton rings. In the world of comics you find can find this kind of refraction in graded comics where a Mylar bag touches a polyethylene case or even another Mylar sleeve.

That said, if it's wet it's wet.

This.

Otterboxes that have built in screen protectors almost always have the very same effect on phone screens. It's not wet, or even damp. It's just the interaction of the clear screen protector, and the glass display.

screen (resized).jpg

newton (resized).jpg

Remove and move on...lesson learned.