I seem to have a problem, this is not the first time this has happened (I've built a couple of wings), but as I am glassing, using Z-poxy, .75 cloth, I keep having areas not absorbing the Z-poxy,and the cloth seems to repel any I try to wipe on. Then, after it dries, I still can't seem to fill the dry weave. Of course, I may know the answer, like dirty foam, oily fingerprints in the cloth, using the stuff around 50 degree air in the garage.... Any help?

I find that a heat gun helps immensly, just blow hot air over the area you are glassing, don't get it so hot it bubbles, just very warm. After glassing, if you take Saran Wrap and place over the glassed area and smooth it out with your hands, let it cure overnight, and when you take the Saran Wrap off the next day, you will not even have to sand the result. It will be very smooth and slick.

Thanks for the tips, I will use the Saran Wrap one next time. I wonder if I used a heat gun, I could get the epoxy to flow into those stubborn areas. On the other wing, I could not get paint to even fill it up.