For future ref - that is an industrial strength sd and way to big for the project. It invites disaster to the card and your other hand / wrist if it slips. I have always successfully used about a 4" sd which has a much thinner blade on SGC slabs, and so, much easier to pop a top corner seam. Then gradually work a slightly larger sd along the top seam, leaving the first sd in place. Never have had to use snips on SGC slabs, since, like the older PSA slabs, they are fairly easy to open.
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