Yep, you have to do very small sections at a time. When I curl my hair, I usually spray it once before wrapping it around the curling iron, and then once afterwards. I have super straight hair but not thin, so it's really hard to get it to stay curly when it's long because it's heavy. When I got married, I had super long hair, and I wanted it curly and half up for the wedding...Well, I curled it all and styled it that morning, but by the time of the wedding, all the curls were out, and I walked down the aisle with straight hair
I didn't take the time to curl small sections at a time and spray it once before and once after, so the curls came out a lot quicker than they should have.