I've mentioned it several times in my Thread of Stuff but never got around to going into any detail on how I made my little putty oven to speed up the curing time of greenstuff (or other epoxy putties), and there's really not much to it.
http://i.imgur.com/5rlK0Yd.png
You will need:
1) Empty paint can with lid - Because you will be using heat to cure the putty, it's worth shelling out the $3-4 dollars I spent on a brand new, unused paint can with a lid at my local hardwarehouse store