OK, Coolant / Antifreeze....I guess my point was race teams want to use something that is more effecient than water at keeping a car cool and are not interested in the Antifreeze elements of product. Whilst this provides an advantage to running cars and is within regs, people will use it. There are also several products on the market aimed at purely delivering a better than water performance, under high temperates, as per racecool or 100% waterless.
http://www.heatshieldproducts.com/productdetail/race-car-and-track-products/racecool/80/25
The site below (although a sales pitch) details why race teams use this stuff.
http://www.evanscooling.net/www.evanscooling.net/info.php?p=2
Agree its slippy, at least its visible, I think some bike series ban it, due to the implications of coming off a bike on it.