How do I use HI FLOAT?

Hi,
This is my first balloon bouquet, I need help with the latex balloons - how do you treat the balloons with the "HI-FLOAT" treatment?

I blew up some 11" balloons with helium last night (02/07/08), but when I came home from work the balloons were limp and not floating any more. What can I do to keep them up high?

Please help me,
Thanks.