DS's hair is very blonde, practically white blonde. Though he's a decent covering of it now it's not very thick and I'm a bit concerned about him catching the sun on his scalp - particularly as we're off to the Algarve on Sat so lots of outdoor time etc.
We've been working on hat-wearing for a while now: oooh look! this hat has Thomas on it, Mummy/daddy has a hat on, hats are brilliant, me & Dh wearing hats round house, ninja-style sneaking hat on his head when engrossed in playing etc etc. The boy will not be persuaded and the longest any hat has stayed on his head is about 1.5 minutes. Stubborn little... 
In the recent sunny spell often resorted to smearing creamy factor 50 into his hair. Not pleasant and not entirely sure it gets properly into the scalp.
Anyone know of anything more 'watery' that I could spray on? Or any other solutions/tips?
Obviously will attempt to keep him in shade as much as poss, but when a toddler wants to toddle places, places must be toddled to and things examined in great detail on the way!