I can't melt a hole in the stuff with a 100 nA focused beam. Adhesion is excellent. In fact, it sticks to silastic mold perimeters. Mixing is a little fussy. 3 parts to 100.
Shelf life is supposed to be less than a year and it's expensive.
The grain size of the carbon filler is relatively coarse. Colloidal graphite might be better. This posting is definitely to help you people and not Master Bond, a company I did not find especially cooperative toward experimenters. I agree with Jean Marc. Consider that most elemental standards for EDS are mounted in resin blocks.