I have removed wallpaper that I hung over 15 years ago. There are some spots where the primer (Zinsser Shieldz universal wallcovering primer) has blistered and pealed off during removal. My question is: What is the best method to seal these spots to ensure peeling doesn’t continue after I paint? I would also like to skim coat the walls to smooth out any imperfections. Do I prime first, then skim coat or vise versa? Also, these walls are plaster, if that makes a difference. Please help. Thanks.
Mudding over Sheilds