Original Posted By: dannymac
For those interested in some of the polyurethane glues, I have tried twotypes. One is a "generic" type from Home Depot, the other is Excel thatI got from Aircraft Spruce. The Excel is a little better flowing andcan be used at lower temperatures, but it is nice that neither requiresmixing. Have run test samples (sanded and unsanded) of spruce to birchplywood, spruce to spruce and birch ply to birch ply (1/16). In allcases the wood or plywood failed before the glue joint. I couldn't evenfail my latest samples this weekend, the wood failed in compression(this is a new batch of spruce from Aircraft Spruce). Not real pleasedwith this spruce, grain is marginal and (again) there are some brittlepieces in my order. All this lack of quality has me thinking I'll gowith aluminum spars when the time comes.On an epoxy note, I also tested some West Systems epoxy at temp thisweekend. By 200 degrees F it had turned back into a soup that allowedthe pieces to separate with finger pressure. The wood was fine. Haven't run this test yet on the polyurethanes, that's next weekend.Hey, only 53 days to Brodhead!Mike L.________________________________________________________________________________