Sure have. I think I've tried everything at this point. Ok, everything I can think of.

It does work, but to me, it's not as easy to control the amount of glue. The viscosity of polyurethane can vary greatly, and that can get complicated when you're trying to keep it really light.

I also have vacuum bagged the cores with honeycombing. If you bag the whole shuck you can get away with it, but you can't pull a lot of mercury or you'll still crush the wing.

In the end I still prefer epoxy. A good low viscosity resin for the solid portions, and a slightly thicker resin for the honeycomb section.

-Mike