Run scrim right across where you want to join. Just before last trowel pull it off and scrape off any residue from under the scrim. Skim upto finished part. Tight coat of filler on joint and sand.
A standard board with a coat of SBR is more waterproof. Water resistant is a way to make people pay more. If they get damp they snap over you back when you pick them up same as standard board.
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