Complaining about people asking questions is so obnoxious. This isn't "what is corner bead?" or anything like that. If asking about proper technique with advanced tools like mud boxes is too basic then what the hell is this forum for?
I recommend following with a next size up knife. One light flow through. Apply with 10", follow with 12" stainless steel knife. Let dry then scrape lap line. Forget sanding. Dust in skim coat makes you finish inferior.
In theory you do not really sand, you just brush down any lap marks and edges. Often times the first coat, especially with smaller boxes, will leave heavy edges. This is amplified by bad board with high shoulders. Just a little love between coats will make everything a lot smoother when running auto tools.
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