There is about an inch of epoxy behind the hook barb. This gives the fly a flatter bottom line which I like. The weight of the epoxy helps to keel the fly in the water since I use light saltwater hooks. The epoxy almost completely stops any fouling of the hook. Which only gets worse with the larger size and length of fibers on the body of the fly.
The fly head is placed as far back on the hook as possible. This moves the fibers further back away from the barb which also stops the fouling.
I am very careful not to get any epoxy on the eyes as much as possible. Any epoxy over the pupil gives it a foggy look and detracts from the life look of the fly.
Now get to the vise.