Sure,
The West Systems epoxy (or other 6 to 1 mix epoxies) are stronger and mix well with fillers.
All epoxies in terms of resin to hardener are 6 to 1 or 5 to 1 mixes.
Hobby shop 50/50 mix epoxies achieve this mix by adding fillers to the hardener (makes it easier for the newbie modeler but is weaker and does not mix well with fillers)
Another reason I use it is because I have a gallon of resin and a quart of hardener in my garage