Again make sure the probe goes on the outside, I would't use hot glue as the only adhesive to keep a probe in place, so much can go bad if it falls off. I would use foil tape, I have included a link below to where it can be purchased. I'm currently using flexwat but I was previously using Zoo Med UTH's, during that time I was using the below duck tape to adhere it to a glass enclosure, I was very generous when applying it, never once had an issue, the temp rating for duck tape is 120 degrees.
http://www.reptilebasics.com/aluminum-foil-tape
http://www.homedepot.com/webapp/wcs/...x#.UL_JTYPonng
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