Sweep up whatever is on your shop floor and dump it in the epoxy mix.

Unless of course you use a metal lathe etc.

Sawdust, especially bigger chunks works great. I just emptied out the filter on my ROS sander and used that last time.

This may not be "as light as possible" though, just lighter than straight epoxy and most importantly to me.....FREE!

Ben Staley

: Helo all,
: Just want to know if I can use 3M micro balloons for a filler in my end
: pours? Do I mix them with my epoxy? What else can I use to make these end
: pours light as possible?