I would say yes. Talc may not be a good choice either, as it is typically added to make epoxy easier to sand. I would consider quartz micro-spheres plus a little Cab-o-sil. For really tough, consider "kitty-hair", chopped fiberglass.

: I've been epoxy coating my paddle tips for some time now, but have recently
: switched from talc to Cabosil for a thickener. I've notice that although
: the tips are very abrasion resistant now, the epoxy tends to chip more
: readily. Is this likely to be due to the Cabosil?