in reply to dretd:
I purchase the Tangle-Trap Sticky Coating from Amazon. They sell it in an 8 oz can that includes a small brush. They also sell it in a quart can with a top like a paint can. No brush supplied with the quart can. I've started using a foam applicator on a stick (purchased in the paint section, displayed next to paint brushes) in order to apply the sticky coating because the foam applicator is 2 inches wide and so the job of applying the Tangle-Trap coating is much quicker and easier than using the supplied tiny brush.
I'm not sure if having the blue color dimmed a bit because of the amber color of the product you used would actually deter the deer flies, because they're attracted to non-blue humans and deer afterall, but who knows.
Good luck to you. Let me know if you have any other questions regarding my deer fly trap umbrella. I'm really hoping it will work for you, because it has certainly worked like a miracle for me and now my husband and I can fully enjoy the outdoors.