I need tips on what products to use on thin hair that will not hold a curl. My hair doesn't curl with hairspray, it just falls flat with one little wave in the middle of it. Please advise as to what products will keep a wave in my hair for an event. Also, recommendations for a curling iron would be helpful too. I want a look like the picture below. Something that doesn't have that hot roller curl but more of messy waves. Thanks in advance!