I actually bought this last week. I colored my hair Friday morning before and planned to do this Saturday morning. I ended up doing it Friday night. I was due to wash it out tomorrow night. I couldn't wait. My hair was quite greasy. The end result...love it! I've never had a keratin treatment before. But, just blow dying my hair looks like I flat ironed it. Only time will tell now how long it will last. I used bout 2-3 oz, so I can get 3-4 treatments out of it.