One thing I did notice about Jessicurl line is that they don't work as well with other products. They tend to work very well with her line, IMO. If it's a Jessicurl day, I need to use the whole line and not mix it with anything else.
Also, you need to apply it to soaking wet hair.
ETA: The only other product that I was able to use with her line was Elucence MBC
anything else gave me a white film on my hair.