Carnauba wax is used in a variety automobile waxes, food products, dental floss, candles, instruments, shoe polish, and floor and furniture waxes and polishes. It is all natural, plant based wax that comes from the Carnauba Palm tree in South America. Carnauba is fairly expensive so many car products have switched to the higher performing longer lasting polymers. These are great for UV resistance as well as dirt and water repelling qualities. Many car enthusiasts use both. Polymers give optimal protection and last longer (don't wash away as easy) but the deep beautiful shine from carnauba is unbeatable.
So why wax a playfield? The deep shine is caused by an actual layer of wax, this wax does make it look nice, more importantly the wax layer acts as a barrier between the steel ball and the playfield paint. It protects the playfield adding extra life and years to your game. Dirt wipes off easily and evidence of ball travel is prevented. Eventually the wax does wear off and needs reapplied. It's a low cost simple preventative measure to get more years out of your playfield.
Why not use polymers on your game? While polymers offer some of the same protective qualities as wax, they don't leave that thick layer. The primary reason for waxing is to add the protective layer and help prevent ball wear. So a polymer might be good for some added UV protection but your primary goal would be the application of a wax for the "protective layer"
What kind to use? That's always the big debate. Choosing Carnauba is the starting point. Since most products are not meant for Pinball, trial and error is next, seeing what works for you and what doesn't. Certainly checking in areas to be sure it doesn't damage the game or its plastics, avoiding abrasives unless you want them. The problem is a large container lasts forever, and can be expensive. So trying lots of products mean lots of money. Some products out there that have no wax at all, and those are usually cleaners and will need wax added afterward.
Greg
Pinhedz.com