I like Bumble and Bumble Thickening Hairspray for strong hold- but this one is applied before you style your hair. I apply it to my hair and then brush it out. Once it has dried, I style and it stays all day. It isn't a finishing spray, but it works wonders.
If you do want a finishing spray, I have found that Bumble and Bumble Does it All hairspray holds styles but doesn't flake. It truly is a great hairspray and like it's name- it does it all