Jim Conlin wrote:
Measuring epoxy is a pain. The mustard pumps are fine if you need 1 to
8 oz. (30 ml. to 200 ml.), but if you need a quart, they're a PITA.
Weighing is hard to do with the level of repeatable precision that i'd
like. There's no practical and reliable way to precisely measure a
small (5ml.) batch.
There are also commercial epoxy measuring pumps, the "Sticky Stuff
Dispenser" and "Goo Grinder" from These folks
http://www.michaelengineering.com/ which look like a good start, but
seem overpriced to me. I'm envisioning perhaps a pair of gear pumps,
geared tpogether at 5:1 or whatever. They could be operated by a hand
crank or spun with something powered.

So, my question is this- Who can recommend a positive displacement
rotary pump that is inexpensive and will tolerate the nasty chemicals of
epoxy, hardeners and solvents?

I'm using an inexpensive digital scale. It was about $40.

Reads to 12 kg +/- 5 grams when over 2000 grams. That's max
of 0.25% and close enough for me. Cover it with plastic and
keep the epoxy off it. I regularly mix up to 8-9 kg batches
with no difficulty.

Below 2000 grams it is accurate to +/-1 grams which is good
down to about 50 grams if I am careful. 5ml is sooo tiny I
can't even think about it. Perhaps a syringe??

Evan Gatehouse