I have used Fusion on kits with no problems. AMT plastic is really soft though so that could be the problem. It has worked fine on old Monogram, Airfix and new Revell plastic. I like their dark Navy Blue
Painting the Monogram tracks is not a big issue. When you build the kit (and pretty much any tank kit with vinyl tracks) do not glue the idler or sprocket wheels in place. This way you can paint the tracks, loosely slip them in place, and then fit the wheels. There is no pulling and stretching of the tracks if you do it this way.
I have used the Tamiya Polycarbonate Spray Paints for RC car flexible bodies. They sell a "Gunmetal" Poly spray that is good for tracks. Its not really what I would call gunmetal - its about like their Flat Metallic Grey jar paint.
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