I've tried countless primers throughout the years and have not found one that lengthens the wear of my foundation, substantially. At best, they allow makeup to apply smoother, while the silicone-based ones (review) fill in pores really well. The ones that are intended to mattify and to control oil do exactly what they're supposed to do, but they also can emphasize dry spots and over dry the skin, especially when they are over applied or applied to non-oily areas. It's important to find the one that's most suitable for you and to apply the product by using a targeted approach. (For example, I use silicone-based primers only on areas that have enlarged pores. I don't cover my entire face with the primer as it's not needed.)
I decided to try out the Marc Jacobs Undercover Coconut primer and the Dolce & Gabbana Sheer Radiance primer along with their Perfect Matte foundation. I've tested them rigorously, using a combination of various techniques, including the use of (1) light-weight and heavy moisturizers, (2) with and without a primer, (3) light, medium and heavy foundations, (4) mattifying and luminous setting powders, and (5) fingers, various brushes and sponge. I've also waited a few minutes for each product to absorb into the skin before applying the next product. Continue reading to find out about my results!