Mudding over Sheilds

Kara asked 6 years ago

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.

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