I learned the trick to mudding is less is more.
And when you think just one more pass over it don't do it.
Thin coats let dry and scrape off the trowel marks quickly. Mud again to 8" wide seam.
Repeat above process and then a 12" knife with the mud thinned out finishes it off nicely.
Also first coat to avoid cracking later use something like a sheetrock 20 or 90. Dries harder.
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