I've never tied or used a crease fly, but have always been interested in giving some a try. I have 1 that I got in a swap years ago, but never wanted to lose it, so it's never been fished.
Tonight, I got the chance to tie some up. They turned out pretty good and I'm definitely going to give them a shot on the water...hopefully this week.
I think covering them in epoxy as most people seem to do is a good idea. I tried to super glue the eyes on and that worked ok, so far, but didn't look as nice as I think a coat of epoxy will look.