Despite all the sun down where I'm at, I only get a little bit on the portion of the leg that is between my knee and the bottom of my shorts. My issue with sun was on my bald head. I used to get a mottled tan up there that matched the holes in my helmut. A sweat cap took care of that and also keeps my head cooler under the helmet.

I can't help with anything useful, sometimes I put on sunscreen, sometime I don't. I don't burn easily and have not gotten a burn while biking four to five hours or more.

Maybe Tom Brady has something.... drink lots of water..... I doubt it though. But the may be enough quasi-science in it to make for lively discussion.

Hopefully this will bump your question back up and other will chime in on your question, not my pokes and faint attempts at jest and meaningless communication.... fatic, wasn't that what my speech teacher called it?