Bullfrog Surfer Formula stays on the best of all I've tried. To me, that stuff is pretty uncomfortable feeling on the skin though, so I usually go with No-Ad and reapply every 3 hours of sweaty time in the sun and right after a dip in the river. Typically don't have to reapply Bullfrog Surfer after swimming.
Last edited by LesterOfPuppets; 08-07-10 at 09:46 PM.