Not sure what you mean by a mist coat for plaster but you can by proper stuff to apply before you pain plaster.
I think it forms some kind of plastic coat in the plaster or on the surface meaning you don’t have to give it abar 5 coats of paint. I think it also protects the plaster from damp if it’s on an outside wall.
If this is what you mean anyway then just ignore me, most do
edit, as for the paint stripping, I know a boss brass who does a good strip.
Have a fire blanket or extinguisher or both handy, just in case
Yeah that's basically what I mean. It used to be done with PVA glue watered down but from what I read that's not preferred now as if the plaster is still the slightest bit damp it seals that in, and the paint going on it just goes on top of that glue layer and is then prone to coming off easier.
So a mist coat is a diluted paint that seals the plaster by saturating it properly so it's not porous when you put on the top coats.