Well, I know the theory. I've watched the video. I told people "just roll and tip". But I never actually did it,,,,,,, until now. Amazingly it works just as advertised. You roll it on, and tip (brush gently holding a dry brush at 45% in one direction only) AND you never, ever go back to touch up any blemishes. How do I know the last part is true......doh!
Still not bad for a first attempt.
I will leave the ceiling in the heads high gloss, but may use a flattening agent for ceilings in the rest of the boat.