I plan on using deionized or distilled water for sure. I might try using no additive for awhile and see how it goes. There will be solder and JB Weld touching the coolant also. But I guess when I place my order for the last of my components I will go ahead and get some zerex. I woud much rather be save then sorry, I don't want anything happening to my waterblock it's priceless! That reminds me: I was buffing my block on the polishing wheel, and I got kinda relaxed and it grabbed it outa my hand. It threw it down right at the floor. BUT it somehow, amazingly, just hit a stray power cord on impact and landed harmlessly, not making a hardly sound, phew.
Thanks for the info,
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