favourite sunscreen/sunblock?

i searched, didn't find anything. and i'm not even sure if this is the right forum, maybe general chat is more appropriate? anyways, what is your favourite sunscreen for the summer? i hung out on the beach yesterday and didn't have my usual spray can, just a tube of the regular stuff. i burned my back where i couldn't reach
i prefer spf 15 and anything in a spray can. i just hate how fast it runs out. i'm also south korean, so i tan really easily. for long days on the beach, like marathon surf lesson days, i'll put desitin on my face. just curious as to what everyone else uses. and if anyone has any particular brands that seem to last longer in the water, spray stuff that doesn't seem to run out after a 2 days, and so on.
