Its basically a clear liquid containing ceramic elements or more specifically a compound called SIO-2 (silicon dioxide). When applied on automotive paint, it essentially acts as a super high performance wax that lasts months or even years. Super water repellency, high gloss, super slick surface, and also some paint protection properties as well since the coating itself is very hard. Harder than the clear coat even sometimes. A coated car, will clean off like a breeze. Even hardcore things like brake dust on wheels comes right off with essentially a hose sprayer.
The downsides of the coating are- expense and the prep necessary to apply, as you wouldn't want to lock in scratches or dirt under the ceramic.
They do make cheap versions from china that I have been playing with on my beater car with good results, and I'm just about ready to try a quality one on my Ford Raptor.
It seems like it would have a lot of properties that would make it nice for pinball machines, both old style and new ones that have actual 2 part clear on them. But perhaps theres something I'm missing, which is why I am asking. When winter hits and I'm down working on my machines more often I might be the guinea pig if nobody else has tried it.
The best form is the actual ceramic liquid, but theres other styles of it as well including sprays and even a handful of paste waxes infused with it, such as Enigma by AngelWax. I just picked up some Enigma, and I'm excited to try it out on some cars and that might make it onto some of my games at some point as well.