Kristine's clever method of sunscreen application:
We use both the aerosol and lotion sunblock during the summer and we always have problems covering our daughter's face.
The other day, I grabbed one of those cheap brushes that come with face blush and sprayed the sunblock onto the brush. I told my daughter that this was makeup and proceeded to brush her entire face with the sunscreen. She actually said 'this feels good Mommy'. I'm thinking you could also tell a boy (or girl) that you are face painting in case you don't want to go the 'makeup' route.
I followed up with Kristine to ask if she could actually get enough sunscreen on the brush to cover her face properly. Her answer: "We painted it on pretty thickly. It worked great!"