CA Glue (Cyanoacrylate)

CA glue (cyanoacrylate, the same chemistry as consumer superglue, sold in woodworking-specific viscosities and formulations) cures in seconds to a couple of minutes rather than the hours a standard wood glue needs, triggered by trace surface moisture rather than air exposure or a separate hardener in most cases. Thin ("wicking") formulations flow into cracks and porous wood by capillary action; thick, gel-like formulations stay put for gap-filling and quick tack-and-hold joints.

Beyond quick repairs and tack-gluing small parts in place before a stronger glue-up, CA glue is the standard way to stabilize punky, spalted, or cracked wood before turning on a lathe -- flooding soft or fractured areas with thin CA and letting it cure hardens the wood enough to turn safely, where the same piece would simply crumble or fly apart under the lathe's speed untreated.