My Grumman 17 foot aluminum canoe apparently had nostalgic thoughts the other night about its aircraft ancestors during some particularly gusty winds, and went airborne and sailed several hundred yards down my field. Remarkably, and thankfully, there is little sign of its misadventures- though it must've been a sight. Probably scared the daylights out of the deer that usually graze around that same area. -but there is a medium-sized dent in the side, right near the center thwart, from just below the gunnel down to a few inches above where the waterline would be when it is in the water. I am -hoping- that with the right technique and appropriate application of whoomp in the right place, it might pop back into shape, or mostly so. But rather than wail on it with random hopes, I would like to solicit tips and techniques, in hopes of doing it once and doing it right, or as close to right, as feasible. Anyone have experience or suggestions to share, either from canoes in particular or sheet metal, especially aluminum, in general. Thanks!