Banana Boat SPF 50. Head
, neck, ears & face only (usually) - Arms and legs have a pretty good base and survive in 5-6 hours of 1Deg North sun.
People complain of the sunblock burning their eyes when they sweat. My experience is put it on well before you sweat, rub it in - you don't need "visible gobs" of sunblock on your face unless you are using zinc. - and you won't get the eyeball pain.
Reapply after 4 hours.
I tried wearing a tennis sweat band on my balding dome to avoid sweat in eyes but looked too geeky.
I tried the big brimmed hats but they fold in front of my face when racing
in close quarters - not cool.
Tried the "North African" hat with the long tail over the ears and neck but so far haven't found one that "fits" right.
For now it's still a ball cap - less than ideal.
I have noted some "dry" skin on my nose - not good. Gotta find some zinc I can live with.