Pat, I looked up the West System and they have an extra slow hardener that would give me plenty of time. Would you use this to "bond" the fenders to the body? Is this to give it extra strength? Or would you use the West system to fill in the bigger portion of the gaps before applying filler?

The body parts are in really good shape. I am already working on cleaning these areas up. I do not have any areas of rust that need repair.