When squeezing out the hardner (the brown stuff) in the t88 2 part epoxy, my hands get tired, especially when mixing larger batches. Last time I was doing that task, I spied a spring clamp laying on the table. I deftly applied the clamp to the bottle and bingo the hardner came out steady and with no effort on my part. Two clamps made the flow even faster.
I'm a genius.