This is in fact my wife's Elmer's wood glue. The one I have in the garage dries more clear, but creates the same voids. I've found it also doesn't want to come out of the bottle below 40* F. I started out with less glue and wiping clean, seemed the right way, but it almost disappeared once dry so I tried to overcompensate.
Thanks to all who pointed out the wood grain orientation is wrong. Good job, Estes! The larger fins were cut properly though, and I'll be sure to remember that tip when I start rolling my own. This may be a little too ambitious for my first wood-fin kit, but hey it was on clearance. Who can pass that up?
Ok, now do I have to fill in these voids, or can I sand/dremel this down and start again with a flatter surface?