I was reading Sharon Znaty's book, Club 0~50 on my kindle (so I'm not sure if it's in print version.)
At one point she says, "..., if you apply a moisturizer with SPF 15 and then apply an SPF 60 product over it, you're walking out with and (sic) SPF 15!"
Is that possible? She recommends using a daily moisturizer with out an SPF so you can add your high sun protection later.
I've never heard that.