Patchy paint on ceiling

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It may be that you're seeing the texture of the paint, not something showing through. Try a different texture roller or a brush.

Foam roller or shaggy? If foam get a shaggy one. If shaggy, dunno. Drying too fast coz it's 'ot?

Si

This is driving me nuts! Maybe I set my standards too high. It gets worse with each subsequent coat (I've been using a medium pile high quality roller).

I've now tried putting it on with a brush. I think it may be a bit better (it's been cloudy for a couple of days so the light isn't so good). However, the paint dries so quickly that it drags and tears, leaving textured piles here and there. If I were to dilute the paint a little, or even quite a lot, and slosh it on with a brush, would this help or make matters worse?

I don't know matey. I did paint a couple of newly boarded ceilings recently; the first coat was 50/50 paint/water, i.e. very thin, and then I went over it three times, I think, but it wasn't particularly good paint.

I wonder if the problem you're having is common in hot weather?

Si