ORIGINAL: combatpigg
I wouldn't try skinning an important project with GG unless there was a little bit of vaccuum.
I'd tend to make the same comment about epoxy - with the foaming adhesive it expands and works its way into the substrates whereas epoxy is where it is unless squeezed somewhere. I did some small wings with 1/32" sheeting and a vapour thin coating of GG-equivalent and weights, and they worked out very well. They both work well, I think in
theory a better and lighter job is possible with foaming PU - doing it is another matter. It is certainly beyond the strength of either substrate. And vacuum is a good idea regardless.
Hey mkI - can't these guys spell?
MJD