I have been using Sterling Mineral foundation for a year and I love it! I have tried the dewy and delicate formulas but prefer dewy as it is less coverage and is a more natural look. Delicate formula has its purpose but dewy for me is the go-to everyday foundation. I am a black woman and was searching for an all natural foundation because I do have sensitive skin. Sterling Minerals offers a great shade range with even better ingredients. Melanie can be a little too warm/golden for me in the winter so I mix in Jacinta to mute out some of the yellow. No exact measurement just eyeball it as I go. The key to getting good coverage with this foundation is knowing your undertone AND really buffing the foundation into your skin. I spend about 2 minutes buffing the foundation in on each side of my face. With this method I have NEVER had flashback an have proof of it! So, you can never buff too much. The longevity is usually about 6-8 hours without any touch up necessary. And even with the dewy formula I do not have an issue with it being too oily. I absolutely love this foundation and will keep using. I haven't used the foundation during the summer but I will this summer and I am looking forward to the results!