Spots that won't cover.

Tammy asked 5 years ago

We repainted a wall that had been painted 12 years ago. I washed the walls well, used Mr. Clean eraser on crayon and other spots and washed again with water. When we painted, the paint separated in some areas and shows several areas where the paint wouldn’t cover. We used a stain blocking primer and the primer doesn’t stick to these spots either. What is the next step? Thanks for help on this.

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