I have super pale skin which is really sensitive the the sun. Now that the weather is starting to improve I'm very aware that I need to up my spf level. Usually I'd wear factor 50. However, I'd like to continue wearing makeup (specifically foundation) throughout the summer. I know that I can buy primers etc that have a high spf factor, but my question is this; how do I make sure I'm protected from the sun all day? If I'm wearing foundation I can't top up my sunblock during the day like I would on my body. Is there any way to get round this?