So I'm 40 and spend a lot of time on windy beaches with kids and finally swapping with DH for an exhausted surf. I need a brilliant sunscreen for me to protect against wind sun and is waterproof but not like thick white paste. Is there anything out there? Is it worth spending a fortune or would a normal Boots range factor 50 for face do as good a job as anything else? I'm worried about having a very wrinkly face by the end of the summer.