I have a rare disorder that causes me to react to a huge number of substances and chemicals (which is the reason I'm looking at clay plastering in the first place) and primers and paints tend to be in that category, with rare exception (one brand of milk paint seems to be ok, at least). I've got to make this myself, from as natural materials as I can find. If something has a processed preservative, even, it's likely I'll be unable to use it.
thanks for the information on the latex paint - I did not know it would peel off, but I can do that, I think! Do you know, Terry, if clay plaster can go straight onto the dry wall or if I need to do a kind of primer prep for that, by any chance?