Also note I am trying this on Aluminum and not Copper. I think Copper will be easier.
I am installing my Copper block now and will test it agains my Aluminum. If the temps are within 1C I am going to drop the Copper all together as it is not worth it to make. I just took off the Aluminum block I made before with the Epoxy and it is in great shape. I smacked it around and tried ripping the top off by the connectors and all I did was dent it up a bit.
I think it will be fine with that Epoxy. I will see how the Copper one does. I will send Joe the Epoxy versions aswell and we will see what he finds.