About 20 years ago, we had a professional wallpaper hanger hang a commercial grade vinyl using commercial paste. As the vinyl is very thick, he obviously had to use a lot, and the vinyl was somewhat textured, not smooth. We removed the vinyl in our entryway. The paste, of course, remained on the wall. We thought perhaps we could just paint over the paste and have a textured rigid wall. We really don’t want to sand and scrubbing it with water, etc. would take a lot of muscle and time. Is this okay? Should we primer it first? What kind of paint should we use?
You can prime and paint the paste, this is fine. The key is to use a good acrylic bonding primer. There are many on the market, Zinsser 123 and Gripper are two good examples. Once the walls are primed and dry you can use any type of paint with any sheen. I recommend using a quality interior acrylic.