One coat of a good drywall primer, like PVA (Polyvinyl Acetate), will give the paint a great surface to adhere to. Don’t expect the PVA primer to give 100% coverage or opaqueness over the drywall ...
With any paint project, it is tempting to skip the primer and go straight for the immediate gratification of applying actual paint, forever hopeful that one coat will get the job done right.
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