Last time when I used the hair curlers I got perfect curls but it did nit stayed for long on my hair. like the curls vanished in just half an hour leaving my hair dry and frizzy. I want to know what could the reason for this? I used the hair rollers on wet hair and my hair are silky black. I did not used any hair spray after the rolling. My sister told me that it did not stay for long as I have not used hair spray. Do you also think it as a main reason for my curls to get open so soon?