I think Krazy glue would be ok, I found these specs on it, I don't see it igniting easily when using a heat pad controlled with a proper thermostat. But if there are options that are not flammable, I would chose those instead, i.e. foil tape.
Autoignition Temperature: 485 deg C / 905 F
Flash Point: 83 deg C / 181 F
http://www.krazyglue.com/products/msds/mkg0583_a.htm
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