: I would say yes. Talc may not be a good choice either, as it is typically
: added to make epoxy easier to sand.

I hadn't heard that, but my experience with it bears that out.

: I would consider quartz micro-spheres
: plus a little Cab-o-sil. For really tough, consider
: "kitty-hair", chopped fiberglass.

I was thinking of trying the glass route, as I would think it would give the mixture more strength. I just hate dealing with fiberglass dust and fibers.