I couldn't answer this when it was posted, but I ordered a bottle of Loon UV clear fly finish in the thick variety a couple of weeks ago and used it for the first time over the weekend. I really, REALLY like the stuff. I haven't gotten a uv light yet, it's supposed to show up in the mail any day, so I just used the sunlight to cure it. It worked out pretty well in my opinion. I've heard that the thick cures tacky, but I haven't experienced this yet. It might be because I set my flies out in the sun for a full day to make sure they were good and cured as the sunlight was being filtered through the window. I also found better deals on ebay than anywhere else. I ended up buying a cheap ($5) uv flashlight instead of the $30 loon one, theoretically it should work the same.
Josh