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Hello,

Is foam or "stuff" a good substance to use to pre-fill a gap? I was thinking of shaving it down after it cures before moving on to mudding and taping.
In my humble opinion, if the gaps are so large that foam is being considered I would cut a new piece of board. If the gaps are in an area where you already using the board at its maximum width or length, I would add board in the gaps then prefill with quick set, use some high quality mesh tape and coat as usual. If the gaps are at a peak then no coat will cover pretty wide gaps.
 
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