My well meaning but short-cut minded friend applied new skip trowel drywall over sheetrock where there had previously been paper in a bathroom. He then applied a coat of semi-gloss latex enamel. I was upset when I heard that he had skipped the primer. Aside from the obvious repercussions like

I finished painting a bedroom approx 30 days ago. There was a spot on the wall and when I wiped it off a hole appeared and the paint could be peeled off in one large sheet. The wall had been primed with Glidden primer (water based over latex) and lightly