The last link is interesting, Kind2C. I think I'd probably go w/just the coconut oil & zinc oxide mixed together tho.
One of my daughters was a life guard for many summers in a row, maybe 5 or 6 yrs total. Susan used heavy
coats of zinc oxide on her nose. Also, she's been a sun worshiper for most of her 49 yrs of life. She's
never had any problem w/skin cancers of any type - Yet, anyway.
Coconut oil is so inexpensive compared to the prepared sun screens i've seen.