[header] How to unwarp wood [title] Wrap the wood in moistened towels. [step] Moisten one or two large towels and wrap them around the wood, making sure that the entire warped area is covered. [substeps] The towels you use should ideally be large enough to cover the entire wood piece. 
Choose towels or rags that can withstand the heat of an iron. When moistening the towels, drench them thoroughly and wring out the excess water.