In that respect, a bowl of cereal is an amalgam.

But I see where you are with the Devcon.
I've used pounds of that material in the industrial setting. I've machined and ground and threaded and textured the stuff many many times on many different kinds of equipment.

It's great stuff. Like anything it has it's strengths and it's weaknesses - and for lighter pitting I can see why a fellow would use it as it has great tooth on most metals. I've used it as bedding on heavy recoiling big bore rifles with great success.