I've made a hair gel before with the unflavored gelatin, water, a few drops of EVO and a little lavender EO.
I kept it in the fridge for about a week, and just dipped my fingers in the jar and rubbed my palms together to liquefy it before styling my hair with it.
It held well and I didn't need any other styler.

What I'm wondering with this PT recipe is why rinse it out?
If you're blowing it dry, can't you just style with it and leave it in?