

Hope someone can provide some guidance here.
I put frog tape on the walls to paint the trims and removed at an angle but the paint beneath is either peeling or bubbling. Under it seems like it’s just white wall rather than paint which makes me think that it was just painted with coat directly onto wall without a primer.
can I just spack/sand and paint over (two-three coats of taubmans endure) or do I need to remove this dodgy layer, prime and then paint?