Wood density and thickness determines the level of saturation and amount of ammonia and heat I use (as well as the extremity of the curvature to conform to). I wouldn't use a tack hammer to frame a house or a fire hose to water a house plant. Some say the overuse of ammonia weakens the wood. I don't know if it does or not but I do know that most powered planes are structurally overdesigned anyway so I don't worry about it. If the wood buckles while conforming you'd be better served to start with another piece of wood.