Polyurethane glue is fantastic for gluing wing skins to foam cores. It's stronger than epozy because as it expands, tendrills work their way into the foam. It's also very light. I've also used it for wood to fiberglass joints inside the fuselage.

It does have it's limitations. I only use it in applications where a clamping force (weight, vacuum bag, etc) will prevent expansion from pushing the pieces being joined apart.

Bottom line: It's wonderful stuff, when used for the right application.


Rob