Trendline Creative Spray is a very strong gel spray that can be used in either dry or wet hair. I have completely straight and thick hair that's very hard to curl but with this product I have succeeded.
I spray a few spritzes into damp individual strands, which I put on hot rollers. After an hour I take the rollers off and I have lovely big curls that last through the night!
The only thing I don't like about this product is that it smells... well, like a gel. So I'll probably will try something else after this.