Do yourself a favour and source some Island Tribe Gel Sunscreen.
I started using this initially in South Africa, and it is absolutely fantastic stuff. It's perhaps a little more $$$ than your regular stuff, but it's well worth it. It's quite a thick gel- you don;t need to use that much, but it does not run. Infact, it's a bit of a bugger to get off but in a good way!
Try it- I promise you won't use anything else for kiting afterwards...
Kitepower stock it:
www.kitepower.com.au/Other wise search:
www.islandtribe.com.au/clear-formulas/for stockists. Make sure you get the GEL version though...