Patched spots show through after painting?

Ruby asked 6 years ago

We have some minor dents in our home. We applied a thin coat of drywall paste, waited for it to dry, sanded, and then applied two coats of paint. When standing at an angle perpendicular to the wall, we can see the round spots where the drywall was applied. It was sanded very well. Why is this happening? Would a primer have helped?

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