Is there a sunscreen that can be sprayed on hair and scalp, hair is thining, don't want to wear

You can probably use Coppertone Continuous Spray-On Sunscreen. I don't remember exactly if it says, but check the label just to be sure.

Is there a sunscreen that can be sprayed on hair and scalp, hair is thining, don't want to wear a hat outside?

Paul Mitchell makes a spray that will protect your hair and scalp. Go to your local salon.