Thanks Walter.
I've got an old lab balance, much used over the last 40 years of experimenting, so I'll be ok on that score.
Years ago, when I was producing polyurethane picture frames, I used a mixer blade of curious design, my own, as it was imperative that I kept the air entrapment to a minimum. With a mixing time of 25 seconds before it started to foam, I didn't have time to de-air it.
The blade was made from an old clock gear about 1.5" in diameter, still on the original shaft, with two small rectangular extensions soldered below the two arms that held the toothed rim.
The wheel was about 80 - 90% of the diameter of the bottom of the plastic mixing cup, and the effect was that the resin folded over the edge of the blade and down through the openings in it, before spinning out to the side of the cup.
The tricky bit was to lower the cup away as I turned off the power, so that the resin on the wheel spun off inside the cup, not over me.
So long as I kept my concentration, it always worked, and lasted the 10 years I was making the frames.
The resin was about 200 cps, so I shall use something similar for the epoxy, then a separate system for adding the aggregate.
we often see old kitchen mixers on the Sunday Markets we have here, so that will be added to the list.
I did wonder if a large magnetic stirrer might be another solution, but have my doubts.
John
It's like doing jigsaw puzzles in the dark.
Enjoy today's problems, for tomorrow's may be worse.