Unless I'm sat on a beach I don't, but otherwise I normally go for some factor 15 whatever brand SHWBO has - I'm fortunate that I tend not to burn, but my Mediterranean blood helps and tend to go very brown.
You need to look at the UVA and UVB ratings - the first being the more important for protecting from cancer so look for that rating, the latter is more dealing with skin ageing and damage.
I've also had good success with p20. It is a little unnerving to use once a day sun tan lotion, so I tended to apply regular spf50 creams in too every few hours but can't say I had any reason to doubt it. The main issue is you can rub it off quite easily when wet apparently, so drying yourself after swimming, rubbing a sweaty forehead, putting on clothes and taking them off will all cause issues.
I just don't understand why all sun creams aren't like that though?
Reimanns P20
(Serious question) Why do others have such a problem? Do I have some sort of basic resistance built up over the decades as a result of having spent so much time outside?![]()