It is because the ethylene glycol already acts as a surfactant and reduces the surface tension of the water. The "water wetter" in this case does nothing at typical coolant concentrations.So, I looked up the product https://www.redlineoil.com/waterwetter and it does actually seem to say it can be used with antifreeze.
I am tempted to pop in to a store and look at a bottle on the shelf, I thought I remembered it saying that it would not be effective in a situation with either any antifreeze or more than 10-20% antifreeze.
Meaning, I thought those running ohh say a 50/50 mix should not even bother with this stuff.
At least they list this one gem of fact:
"Does not lower cooling system below the thermostatically-controlled temperature"
Something that is usually lost in these discussions and why I asked above if the track car had a thermostat.
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