I like to prime painted surface with Zinser Bin Sealer. It is a pigmented shellac that dries quickly, sands smooth, and has good adhesion quality. On items like pine boards, it seals the knots well and does not allow for bleed thru. Few things I might mention with this: dries fairly quickly, make sure to use in a well ventilated area (I use in ventilated area and well as use a paint respirator), product is thin in nature, DO NOT use with foam brushes. If it were me, this is the way that I would go.
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