I really love the recipe for flour paint on this website but I was just wondering a couple of things about it.
Like, what is the purpose of the black soap in it? And would any liquid soap works as a substitute?
Also, how come the paint mixture will only last a week or so, when its not been used, yet when its been used and applied to wood, it lasts for years, even though it's in contact with the air, something the unused paint is suppose to be kept away from?
Also, could you use this paint recipe on non-wooden plastered walls inside a house?