I have made it so it has the consistency of soft bread dough and it still cured alright. Use longer curing epoxy, mix it up first and then add the microballoons. Mix it in stages so it all gets mixed in good. When it "peaks" when you remove the mix stick, it's almost there. You don't want to too thick as itwon't be able to flow into crevices when the glue heats up right before the cure.

If you remember what Epoxolite looks like after you have mixed it but before it cures (relatively soft), that's almost to where you can do the microballoons successfully. Practice on scrap wood if you want to experiment.

Don