Man that is so cool! I was in one of the Halloween stores on the weekend and i saw a commercial "spider victim" that looked really cheesy and they wanted $59 for it! It was nowhere as good as yours. I have wanted to do a spider web for so long and your victim has inspired me, i think i'll get to work. Thanks.
I put some laundry detergent in a spray bottle and watered it down. Probably about 50:50. Then let it dry. It glows like crazy under a black light. Just remember that anything this detergent over-sprays on will also glow so be careful where you do this.
I am not having any luck with my spider victim this year. The webbing I am using is really cheap, need to go and step it up a couple of dollars. I have printed your picture to go by. Thanks for sharing.