Hi Ladies

I am going to Disney for a few days next month then on a cruise with a double dip at
Castaway Cay. I hate wearing hats in the sun, but I have very thin, baby fine, tends to be greasy by the end of the day at the roots, long blonde hair (yes you can see my scalp through my hair) and I often wind up with my scalp or at least where I part my hair sunburned at Disney or the beach. At Disneyworld I usually dip my finger in sunscreen and dab it along my hairline and part, but of course that ends up looking greasy at some point during the day.
I was in Ulta today killing time and noticed a Nioxin Scalp Shield on the clearance rack for $3.99 so I bought it. It says to spray it right on to your wet hair before you dry and style. Has anyone tried this before? Did it work? Did it make you hair greasy looking?
Thanks in advance,
Rhonda