lol it is sugar water!!
Dominique Dawes talks about it in an interview on wcsn.com:
[quote]For those who watched Jana spray water on the bar prior to her performance may have questioned, why add water and not just more chalk? From my international experience, it is not uncommon for the bars to be slick after competitors that do not use grips. The use of sugar water is common for many international gymnasts. This combination of sugar and water creates a sticky texture for a gymnast that swings bars bare handed or with gause or tape grips. Now, for the gymnasts who wear leather grips, the texture is left slick because when the sugar water dries on the bar, it creates a hardened film. This is why you will she grip wearing gymnasts scrape the bar, re-chalk and spray the bar down with water. Just a little insight on Jana getting a good grip![/quote]
the full article is at
http://wcsnblogs.com/gymnastics/dominiquedawes/
we spray the bars with water too to make the chalk on the bars a stickier surface than if it's really dry and chalky!