Mar 28, 2014 - Not sure as a "deep conditioner". It provides great slip and it does moisturize the hair initially. But as you are styling your hair, my hair begins to feel hard...like I have no conditioner on it. To be honest, I didn't let it sit for 20-30 minutes nor did I apply heat but I feel that it should have lasted longer on the hair. Once my hair air-dried while using the Pantene Curling Custard, it was dry, hard, and flaky. So since I didn't let it set for 20-30 minutes, I'll rate it in the middle.