A five inch crease fly with epoxy will be very heavy, but then I suppose no pike fly will be fun to cast. When I spoke with Joe Blados, he recomended against epoxy. As for the Blados kit, it's not the sticky foam you're after(they sell that at the craft store), but the transfer foil. It is very cool stuff and if anyone knows of another source, please let me know! This is not just holografic mylar, as the holographic material actually transfers from the mylar backing to the fly(like gold leaf). The possibilities with this stuff is endless.
One cast can change your day...maybe your life.