We just bought a fixer-upper and I was prepping the walls in one of the bedrooms to paint. I was gently scraping away some peeling paint around an outlet when it started coming off in huge sheets (some as large as my body) down to the bare drywall (like I can see the pencil marks on the drywall with the measurements written on it). Not all of the paint came off either. In some spots the paint stayed on. At first it appeared that it the paint stayed on in places where there was mud (j/c) on the wall (seams, nail/screw holes, etc.), but in other places it peeled off the easiest on those spots so there's really no rhyme or reason to the madness.
After google searching, I've found numerous reasons as to the problem ranging anywhere from moisture issues to no primer to painting on dusty/dirty drywall. And as far as fixing it, well the suggestions are even more wide-ranging. It would make sense to me that I would put mud over the parts that stuck and feather it out to try to even out the wall, sand, wipe, mud again, sand, wipe, and prime. But it appears there are some who suggest that I should use oil-based primer on the wall first, then mud, then primer again, and then paint. If this is the recommendation, do I put the first coat of oil primer over everything? Including the latex paint that's still stuck on the wall? Or just on the exposed drywall?
I have no idea what to do. Any thoughts, ideas, suggestions are welcome (short of burning the house down--bc I would like to live there eventually).