It'll bond to almost everything but polyethylene, polypropylene, Teflon and some plastics. They cure in 24 hours to a tough elastic film that absorbs slight joint movement but won't creep. Cured squeeze-out sands off without clogging sandpaper or scrapes off easily with a scraper or a chisel. But polyurethane glue is peculiar stuff. Yellow glues harden by drying, and epoxies harden by chemical reaction between a resin and a hardener.
Polyurethanes cure by reacting with moisture from air or materials.
Bone-dry materials actually need to be dampened before glue up. The glue foams and expands as it cures to penetrate surface pores and irregularities. Assembly time is about 15 minutes to 30 minutes compared with just five minutes for yellow glue. Clamping time one hour to five hours compares with about 30 minutes for yellow glue. Polyure-thane lacks the early high tack of yellow glue, which keeps mating surfaces from sliding around, but the slipperiness can allow joints to be unclamped and repositioned for up to 30 minutes after initial clamping.