I'm buying some to put in the V8 next year. Its not cheap though. The engine has to be bone dry and free from water. So you have to drain and dry as best as possible and then fill with Evans pre treatment coolant to extract any residual water. You can use the pre treat 3 times I think, but it has to be stored in air tight containers.
Then add the main coolant and race. Main coolant can be used over and over again as long as its dry stored between refills.
This stuff has a boiling point of 180C at sea level. So at engine normal engine temps for racing (around 100C) there is no pressure in the cooling system. And no air either
7 litres of pre treat and 7 litres of coolant is about £210 though. But the fact that the cooling system will have no pressure build when hot is appealing to me.