Although I am not one of the Fastest guys at Revelation, I did attend the Roar Region 12 Chamnpionships last month and got alot of info from the race. They "Did Not" spray the track with anything that I know of. They have a machine that sucks up the dust and debri and they let the cars make the groove.
Most were running 42 40's or 40's all the way around.
Temperature stays somewhat consistent at the track unless it's pure sun all day.
Gearing is important, what type of car will you be racing !!!
Maybe some posts from different individuals that attended the race will post to let you know.
I know that the 26th annual McCoy Championships are also being held there June 20th - 22nd.
More info should be available about the track after that race.