Pay special attention to the extra dry blocks . Make sure the walls are gooey. If you don't then the paint just sits in the surface and is easily knocked off. Use a broom to apply. Rollers are no good.
Brushes are too slow.
First coat ends up a mixture of mud and paint. Allow for at least 5 coats. If you want clean lintals and top plates, mask. Slightly more geletin seems to give a better result. After every coat mist the surface for a couple of days.