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After it drys(20 min mud) scrape with 12 or 16" knife. That will get all the high spots flat then follow with top coat. Once dry, you scrape, then you gotta sand, but just very little. With a sponge, all the high and low spots will stay the same. when you scrape, you actuall knock off the high spots. I do that 2 hour after 20 min sets up.
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