I take the stick sunblock, make a part, rub the sun block on my/kids scalp and then style our hair (blowdry it etc) . . . this way it's really on my/kids scalp . . . it seems to work, cuz I notice theirs parts get really red if I don't do it! If you do it while your hair is dry, it will make your hair greasy!
Have you tried Clinique City Block? It's super light! It works really well and is hypoallergenic . . . pricey, but a little goes a long way, and even if you apply everyday (I do, I LIVE in FL!) it bottle lasts about 3-4 months!
Clinique | Sun + Body | Sun Protection | City Block Sheer Oil-Free Daily Face Protector SPF 25