Jim, a planer is for "planing" the boards to the desired thickness. It will not remove the warp. That being said, if you search the internet you will probably find it can be done, with use of some jigs/sleds. A jointer is more for removing warps and cupping. But with thin wood if the bow is more thin the thickness of the wood it won't get rid of it because it will eat all the wood. I think you would have better luck using weights to put on the wood and letting the piece sit for several weeks under weight. There are also some method like wetting one side, them putting weight on the board to flatten it. I am not an expert, but there is tons of info on this subject on the internet in woodworking forums and such. There is also lots of info out in the internet land about ways to stack wood to prevent the wood from warping, cupping, etc.