Is ther some way to get a dent out of a tank besides fill it with putty?
A. Some bike shops have ways to blow air into the tank, pressurizing it and popping the dent out. But most weld a brad to the center of the dent and pull it out with a slide hammer. Or this can be done in the home garage by welding a nail to the center of the dent, securing the tank either in a vice or on the frame, and using pliers to pull out the dent. Then bondo should be applied to smooth it out. Another technique involves freezing water in the tank to pop out the dent. Close the petcock valve at the bottom, fill the tank with water all the way to the top, replace the cap, and place the tank in the freezer. Allow the water in the tank to fully freeze. Usually takes a good 24 to 48 hours. The water will expand a small amount as it freezes causing the dent to be pushed out and hopefully removed. After freezing, remove the tank. If you need more dent removal allow water to thaw and repeat. This process is really easy and only takes some time. Other members have had good luck “picking”
