Yep. P20 is the business. One off application 30mins before you go out. I don't use it on my face though. I try & use a non pore blocking high spf. "Simple' do a good face one. "Aloe Gator" spf 40+ gel is great for water sports & it doesn't sting when it's near your eyes, it isn't greasey either as it's a gel.
Main thing is to try & keep out of the sun-you don't want to end up looking like a raisin!
Pale & interesting rocks!