I used the foam shavings that were left from shaping my seat, along with an assortment of sawdust, microballons etc. I don't know how strong it is, but so far it has not blown up on me, and seems to be relatively light.

JJ

: 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?