Then you are fully aware the products you'll be using are designed for temperatures far greater than you should reach water cooling your computer, they are designed for covering much more metallic surface than a water cooling setup is in contact with.
The main reason they do not cool as well, is the engine thermostat is designed to hold that fluid in the engine block until it gets hot enough to transfer to the radiator, and that coolant will not have the heat absorbtion time, in a computer water cooling setup.
I totally appreciate your past learning base, but I would never use those products to cool my computer, additionally if you ever have a leak your animals could get to and they lap up that fluid! That's Bad!
But it's up to you, I'm just voicing my concerns.
That's it, and all I have to say regarding it.