I have read responses to threads that mention the foaming urethane glue. Some love it others would never use it. (Is that different from anything else?) The one time I did use it the bubbles formed (from Carbon Dioxide formed during the curing process I'm told) would seem to indicate that large gaps need to be totally eliminated. I emailed the manufacturer of one brand and the response was not to use it anywhere it would come in contact with fuel of any kind. I would like general opinions on whether to use it or not and how. What is your experience?

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

Ditto what Rob said.

Vince

It is great for sheeting foam, as stated above. I also use it for gluing in Robart Hinge points.

Some people try to use it as a replacement for CA or even epoxy, it is just not meant for that and probably that is why they don't like it.

Rob is correct, used in the right application, it's the best thing since sliced bread. The only drawback I see it has it the time it takes to cure. But, good things take time. I think you could glue an anvil to a wall if you had a way to hold it there to cure. I've grown partial to Elmers Pro Bond. I'm sure there are others just as good, but I've found a winner and I'll stick with it till I see something better.
Randy