Flyboy, while wetting the wood on the underside will work, it works better wetting the outside of the curve. This causes the wood to expand and push it around the the dry side. I found this in woodworking. If I laid a 2x4 on the damp cement shop floor, by the next day it would be bent upwards on the ends because it expanded and pushed. Try this. Also a heat gun will cause it to try and pull in.
If it's wet enough you can bend it (Almost) either way. Depending on grain.