Has anyone ever used It's a 10 Leave-In Conditioner spray? What is your opinion of it? I have colored, keratin-treated hair. It is thin. For years, I have used a silicone-based serum as a leave-in, which is a heat-protectant, smoothing serum. My hair has gotten thinner over time, and I think the serum is too heavy for my hair now. So I am looking for a new leave-in treatment. I'm not concerned about anything being silicone-based, because I get a keratin treatment every 8 weeks, and my stylist uses a clarifying shampoo before applying the keratin, which removes any build-up.