Well? For one, proper application of hair gel ensures that your intended hairstyle comes out exactly the way you envisioned it. Also, it ensures that you use just enough gel for any kind of styling; that way there is minimal wastage and longevity. So: With that in mind, you should note that gel application isn’t exactly rocket science. Now, wait it out. "The rollers should be left in for a minimum of 10 minutes or up to 30 minutes while you run around and drink coffee or do your makeup," says Trygstad. 4. Removing the rollers ApQkwx.