I would not recommend steaming arrow shafts. It has not turned out well when I have tried it. With split timber shafts, the moisture swells the wood and more or less ruins the shaft. Wish shoot shafts the effect is not quite as dramatic, but it still does damage. Grease and heat work really well. In fact, the grease isn't even necessary for repairing small bends. Heat is all you need. Though, if you are straightening cane/boo shafts, use grease!