1965 Bathroom originally had oil-based paint, prior owners painted over with latex. Latex peeled. In huge sheets. Mostly. So, we attacked it thinking we'd get a fresh start with the old oil-based paint as our base layer. We now have walls that are a patchwork of oil, latex, wallboard, and spackle as the latex adhered so unevenly throughout and even the oil peeled off to wallboard or spackle elsewhere. Do we give up on removing the remaining latex that seems well-adhered, spackle the whole room to cover all the uneven base layers, and paint from there? ...realizing that getting a smooth surface will be challenging so... orange peel the whole room to hide unevenness? Do we re-wallboard? add layer of 1/4"wallboard? Any ideas to get around 4 different base layers? probably ~170 sqft of wall plus ceiling (ceiling is not peeling, lovely pink latex paint).