Question about heatsink adhesive...

Hi all! I put some copper heatsinks(from raidoshack) on my quark 125(cut a hole in the case),that already had sticky heat transfer tape on them. It ran great and never got over 135f in my revo(even geared for 55+mph) Now, at the rc-m bash(last time I ran my revo) the heatsinks were knocked off because of the monster triple! So, my question is, could I use some JB-Weld as thermal adhesive?(I do not think it conducts electricity) I'm having trouble finding thermal adhesive locally. So????????????????????? your answers will be greatly appreciated

Bye