Painted 1 fence panel, took me 3 hours as it's really fiddly and trying very hard not to drip etc. Anyway as I'm getting to the end the paint started to be lighter, I never mixed it. I painted the whole thing. with the layer of oil off the top. Redone about half of it but I've given up now.
In my defence I've never got outdoor paint before and assumed it might be different.