I have a 1970 Yamaha CT1B and was working on the fenders to get ready to paint them. The front fender is from a 1970-1972 175. I'm not sure what year. Does anyone know the material this is made from? I would assume it is made from aluminum, zinc, or magnesium, because it is not rusted, unlike the rear fender. I ask this because I was using a propane torch to get a few dents out, and it melted a hole right through it. Would I be able to do some sort of welding, such as TIG? Or would my better option be to use fiberglass or Bondo over it?

The rear of the front fender