Found this while looking for something else, for those of you who build larger it may be of interest. Just for fun I tried it on a bit of soft drink can aluminuim and it seems to work ok on that as well.
http://www.largescaleplanes.com/tips/RatoMarczak/Embossing/Embossing.php
http://www.largescaleplanes.com/tips/RatoMarczak/Embossing/Embossing.php
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