It needs to be heated to 350 degrees to (what they call turn over) and it can be shot or poured in the mold. You can add color before or after it's heated. I'm a newbie but I color it after I heat it.
I know that you can add a small nut to your colors to help them mix up. Since I don't get to play with my plastics enough could I add some in it to help it mix up better when I shake it ?
I've only used the tip-top adhesive but I'm sure that Devcon would turn loose with heat. My only worry would be how hot you have to get the Devcon to release.