I've noticed a marked difference between Metal 2 Metal and All Metal.
The All Metal is hard as a rock and almost impossible to sand to a smooth finish.
The Metal 2 Metal feels and sands like regular filler to me. It's grey color gives it the appearance of grey primer when sanded.
I would GUESS that All Metal may be a little more resistant to moisture.
I don't think either one is a bad product as long as you understand it's limitations just as you should with any other plastic filler.
Just my observations...
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Greg Reid
Palmetto, Georgia
 
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