Years ago at a track I used to race at regularly got their loose dirt to settle down by spraying root beer and other sugar soda all over.. It did work! The track packed like concrete! and smelled yummy! It went for a time from a loose dirt track to blue groove.. a lot of work keeping it that way.. another down side for us racers is that it beat the crap out of our gear! Guess they sold more parts that way!
I was at a race track in Bakersfield, CA (Racer's Haven) a few months ago. They use some sort of oil slurry. Said it's normally used on rural dirt roads. It sort of looked like asphalt! Traction like it too! It was about 1 set of tires (Losi BK bars) to a race! Fronts didn't last much longer either!