Review (4/5): My hair was smoother instantly, and the shine came days after
I applied this to my hair in the morning before I showered and left it on for twenty minutes. Then I took a shower, and washed my hair as usual. My hair was smoother instantly, not necessarily "shiny." I have color treated hair (which this product is recommended for). Two days later, my hair was noticably shiny. I've only used this product one time so far.