I've always used poly in the past, applying to the skins (first with a notched CC, then a foam roller to get a very thin even coat.) This wing will be different though since the glue has to be applied to the core.

On this project, I tried applying the poly to the foam on the tail surfaces and found it difficult to tell if I had enough or too much. With epoxy, I'm thinking I can apply it heavy and then soak up the excess with toilet paper before applying the skins.

Everything I've read about vacuum bagging said you can get away with less glue. We'll see!

Oh, and more thing about poly and vacuum bagging. I read you shouldn't combine the two since poly requires humidity to 'kick'. In a vacuum, you are removing the catalyst. I read this after I built the last set of wings but fortunately never had a problem. I don't think the partial vacuum we use is enough to stop the curing process.