Could be glue, though I've used a number of different glues in projects for our boats w/o issues for her. Not sure howmuch glue they use but they sure are happy with the pin nailer and staples...
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Rip & Beth
2021 3121RL Legacy Cobalt FBP, MORryde IS & pin box
2020 F350 PSD CCLB SRW
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