I would look at epoxies, most (many) will handle 150C. Heat ot the 
highest temperature expected, and then they will remain solid to that 
temp. Check:the West 105/205 or 206, or MGS epoxy systems.
http://www.wicksaircraft.com/catalog/product_search_results.php/start_num=11~search=ZXBveHk=/index.html

For fillers, the micro ballons are considered non-structural, but might 
work for your application , or milled glass
http://www.wicksaircraft.com/catalog/product_cat.php/subid=5395/index.html

If you have someone building a composite airplane or boat in your area, 
they should have the materials, and probably will give you the small 
quantity you need.

Jake Anderson wrote:
> Richard Prosser wrote:
>   
>> Jake, How about non-acetic silicone rubber?
>> Or a shellac type varnish that may leave you some air passages to push
>> air through for cooling.
>> Just a guess, I have not had this problem myself.
>>
>> RP
>>   
>>     
> I've looked at silicons but i have no real idea on where to get them. 
> The people i usually deal with are fiberglassers and epoxy is considered 
> a bit fancy for some of them. If you have any information on where one 
> could get sample kits and the like it would be greatly appreciated. I'm 
> familiar with the generic hardware store stuff and while its temperature 
> handling is fine its nowhere near structural enough. The "magic goo" 
> will be transmitting the torque from the motor windings to the mounting 
> (and hence the bot).
>   
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