I pulled out some old estimating notes (I tell you, this apple did not fall far from the pack rat's tree) and I used to estimate @ 200 sf/gal - that means I prolly could get 250...... which means real painters should realize 175 - 200 sf/gal.
That's for skim coat over blue board.
Old dry raw horsehair plaster was even less.
That's for skim coat over blue board.
Old dry raw horsehair plaster was even less.