Best gun I have ever had for masonary paint is the one below, you dont need to thin the paint.
Bet it needs a ginormous compressor?
Tried it - can confirm!No it won't work, it would be way too thin so would need loads of coats to cover not to mention it would run down your wall, the sprayer you need would be pumped no air involved the Paint pot sits under the pump and paint is pumped under pressure to the gun