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Just fill your low spots along the edge with more filler going out far enough to make it easy to work filler and block sand down as best you can. Then I would coat the whole side with poly putty and hand board down with 80 grit.And then go with your 2-k primer or a good coat of sprayable poly primer.Do not tap down high spots unless there's something that's way to high. Sometimes it can mess thinks up.
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