The panel mastic is more of a sealant than it is an adhesive. You don't want to use it to try and bond things together. Won't your supplier purchase it back from you ?
I've also used it for external sealing. Where walls butt each other, I run a bead up that inside corner and it always seems to be a spot where the seal isn't as tight as I like it. Sills are the biffest weak point in respects of sealing in SIP systems. I religiously, run a bead at the inside and outside where the cripple is attached to the trimmer. Always seems to be a small gap at that location.
If you're building more projects, use it to seal under your plates.
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