If you've got a metal case, then you could also try burning/melting the epoxy off. My bet is it's got a lower burn/melt point than a metal res/case lol. I wouldn't even think you'd need a blowtorch, maybe just a jet lighter would do.
WAIT!!! Epoxy has no melting point! You'll warp the case and scorch the paint off before you melt the epoxy. It can burn or become discolored and brittle at temperatures over 600 degrees Fahrenheit, but it simply wont melt as it was designed not to.