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I have check the ratio on my pump several times(Jeffco system), and had
varying results with temperature.  Sometimes as much as a 50% varaince with
the amount of hardener.  Independant of sending the pump back, I have a
question.

All of the batches I have mixed seem to harden, but what test is there to
determine the actual strength, or more appropriately, the "correct" strength
of the hardened resin?

As I move along through the construction, I would hate to have peices that
are hard but not HARD, do you know what I mean?