Also, I know that you are going to use the JB weld, and that Katchupoy has used it, but lets think about this a little, a thing of JB weld costs right around 7 dollars, and a thing of arctic silver costs 6 dollars, first it is cheaper, and secondly the thermal properties is more like a thermal resistor instead of a thermal conductor. So if you can get the right product for cheaper then why not just use the right product. If you look inside of your LED the crystal that is responsible for the light is connected electrically with extremely small wires, as the heat of your LED package goes up the life of the threads and the crystal goes down. Ultimately leading to the loss of longevity, additionally the color spectrum of your LED is highly dependent on the thermal transfer. So just something to think about when doing this.
