I cleaned the kitchen walls before painting, but apparently not well enough. Ended up with a primer coat sagging on the wall, with some kind of oily surface causing the problem. My partner suggested to allow the primer to dry and scrape it off the next day. This dried primer is like rock (called Bulls Eye 1-2-3). Any suggestions on the best way to remove it would be appreciated. Area is about 4 ft. wide by 8 ft. high. Thanks!
What Chris said. No need to remove it. Sand off the runs and spot prime those areas and you're back in business. Can't imagine primer being rock hard after a day or so but that would be to your advantage when sanding. Soft, gooey stuff in much harder to sand. Buy a 3m Sanding sponge or some 150 grit sandpaper and see how that works. If it doesn't remove the runs, scrape as much off as you can with a razor blade scraper then sand with an electric palm sander. It will take some elbow grease but it can be done.