With the EM's, be careful of waxes that contain any type of petroleum product. I can post a picture of the can I bought once I get home because I thought I bought pure carnuba wax. The gentleman that bought Royal Flush from me flipped the can around and sure enough there it is. From what I was told it can damage the playfield art work that isn't clear coated, and dry out the playfield. Most folks have said use just Novus2 on the playfield. Currently it is all I use. I do understand Novus2 is a light abrasive so I use it sparingly.
I think it's been mentioned that pure caruba wax would be too hard and un-workable without some type of additive, hence the pertroleum additives. I've been instructed by an OP with hundreds of machines, and servicing thousands, to use nothing but Novus2.
And yes, in the short time I've been here I've read several posts related to wax
Kinda like the thousands of oil threads on the Triumph websites lol.