True, but the current "hard coded" evaporation rate that is used doesn't work for racing, it creates a situation where the racing line is bone dry and the off-line is over 90% wet. AFAIK the sim doesn't take any stance on the type of material, the conditions, etc. There is only one, fixed evaporation rate. No, it doesn't depend on any of these from my experience in doing league racing in wet. But it would be nice if it did.