I would glue 2 edges together, stick one in a vise, then clamp a bucket to the other piece, with a fish scale between them. Slowly fill it with sand or water to add weight and see what the shear strength is.
Crude but will demonstrate the effect.
Try several samples with different prep styles too. Sand 2 pieces with 120Grit, and leave 2 with saw cut edges, clean it with alcohol so it will stick well.
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