Anyone that knows me, is aware that I have a very strict sunscreen policy. Most of my friends, at one point or another, would have had me in their ear like a nagging mother about the 'importance of wearing sun protection' and so forth.
I have heard every excuse in the book...
'But I like having a brown face'
'It gives me pimples'
'I have SPF8 in my foundation. That's enough'
'I only wear it in summer'
'My skin doesn't burn'
None of those excuses cut it with me, unfortunately. Brown face = premature wrinkles. Pimples? Try a different brand. SPF in your foundation? It's not enough. Only wear it in summer? Umm...pretttty sure the sun also comes out in winter... My skin doesn't burn? UVB rays are different to UVA rays (rays of the ageing kind).
If you want to age at a rapid rate & acquire premature pigmentation, those excuses will definitely work. But, if like most women, you want to slow down the ageing process, sunscreen should be the Robin to your Batman. The Minnie to your Mickey. In other words, you should always have it close by.
Some of the science behind sunscreen: