JUST gonna start this off by saying that this primer is awesome! I recently picked this up from Ulta and I love it. I decided to try it because of one L'oreal was on BOGO and two because I've seen it in so many makeup tutorials on youtube specifically Shaaanxo.
Above I've swatched the Magic Lumi primer it's a white pearlescent color. When rubbed in it gives the skin and frosty sheen but once your foundation is applied it looks amazing it really helps diffuse the look of pores and it photographs amazingly. It can be applied under foundation or over top as a targeted luminizer, I've used both ways and was very pleased with the results.
Are you using a primer? Let me know in the comment section below.