rouquinne's method is almost exactly what I used to do when I straightened (I haven't since about early September). My hair is also fine, BTW. I think the main difference between rouquinne's method and mine is that, rather than dry the sections 100%, I dried them NEARLY to that point and then went over my entire head one section at a time with the larger barrel on this:
That's the method I used for YEARS (not kidding - years) and it worked EVERY time. BUT... the curling brush will give your hair a flip at the bottom rather than being 100% straight. So, if you don't like any flip, this won't be the answer for you.
Oh - and, believe it or not, I didn't use ANY styling products when I straightened. As long as my hair was well moisturized, I didn't need any. All they (styling products) did was either make it feel gross or make it GET frizzy... definitely NOT what I was after.
~ Northern NJ
Properties: Dense, Fine, Low Porosity, Low Elasticity
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What I used in this photo:
: Suave Tropical Coconut Condish
: CJ Smoothing Condish