>1) Anyone have input regarding AR-100 epoxy pumps either good or bad ?
Yes. Don't get a pump. My pump (not AR-100) sometimes mixed wrong (air
seeped into the piston chamber half the time after prolonged sitting) and
was so far off the epoxy would not cure. I chose to use a balance
(Sartorius) instead and was very happy with it. I thought it was a good
investment in the project.