I used a hair dryer and turned the heat up and let the intake suck my t-shirt around it to get max temperature rise. I did each vane for approx 15 seconds and it did not work at all. I walked back downstairs muttering "what a load of Crap" and when I went to put the arrow in the case noticed the vanes were like new again. It definately works. The temp needs to be pretty high though.