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 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?