The last time I was an Authorized Optimum Coating Installer, there was no training, just pay a lot of money to buy the product.. And the price kept going up every year..
Then, It got completely over my budget by going up a huge amount more, for the newest product, and you had to purchase so much of it..
Exit, stage left, for me..
I have a business acquaintance in the city that has absolutely no training in Detailing, or how to run a machine much less a Rotary, and he was able to get on the preferred Optimum Installer list and has to to pay big $$$ for the latest and greatest coating, etc... His primary business - Clear Bra, 3M, etc., window tint installer..
I trained his son-in-law how to use the Makita, and Optimum Hyper Polish.. It was a quick 4-hour class on a new Black Jeep that needed correction on the front end only - the part that was getting coated... Of course, I turned that front end into a mirror..

He was pretty good at learning, and I told him he needed to go out back and work on his Dad`s, Dad`s old black Lexus until he was good enough to work on a Client`s car..
I think the cost of getting a vehicle Coated now is so expensive alone, that most of his Clients just say, apply the Coating, I don`t care about the paint defects...

If there was any "training" on how to apply a coating, I think it might be - "watch this video" kind of training..
DanF