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This is the answer I was expecting bit I wanted to double check. I've had bad luck with p20, but that is because I bought a bottle and forgot about it for five years and then was surprised when it sweated off and I burned.
I shall buy another bottle and give it another go.
Long mountaineering days are the problem for me. 12 hours in high UV sunlight with periodic sweating on a bad day.
P20 (factor 50) - Once it's bonded, it doesn't pour into your eyes when you sweat.