Prob not a lot,a painter and decorator I know went on one and I was on a job with her a couple of weeks back and she asked why I mixed more up for my second coat as they taught her to do two coats with the same gear lol.take your money then teach you wrong.im not saying two coating with the same gear is unacceptable,it has its benefits at times but you need to learn the correct way first.Out of interest how much did you pay for the course and what did you learn?