I don't rewet my hair, but I do mist it with water before manipulating it for anything. To do my roots for a puff I just add more water than usual to the front (not to soaking, b/c that just makes it curl more and it will take forever to dry)
With my hair I start shaping my hair into a puff - pushing it back. Then I add my gel, and I focus on the baby hair edges area b/c they curl up the most. Once that's on I use a soft brush (it feels like a baby brush) and start smoothing my edges. You should be able to get to a point between the water and gel where they will 'stick' and lay totally flat for a moment before they wave up. When you get to that point keep working the brush back until you hit about the crown of your head, and then fasten your puff (if you use pantyhose, fabric, whatever). Now smooth your edges back down, and tie a scarf over them to set. It helps to tie it a little further forward than you need, and then then push it back.
Keep the scarf on for at least 20 mins (I do it while I'm getting dressed). If you're in a hurry or your hair is very wet, you can hit it with the blowdryer for a min or two (with the scarf on) and then remove the scarf after it's cooled.
Some products that can help lay the edges down: Wax Stick, Gel ( I use Eco Styler), Castor Oil, Pomade or good 'ol grease, Elasta QP Glaze. HTH.