After using many different epoxies, I come back time and again to West System. It has yet to let me down, ever. (Other brands have at one time or another.) At wholesale prices, and in larger quantities, the price is very competitive with other brands. But using those wimpy mini-pumps was just ridiculous. For a shop doing frequent and varied fiberglass repairs and installations, the gear pump is the only answer.
Now, I easily go to the pump and dispense as little or as much resin and hardener as I need, with no effort. The pump automatically meters each component perfectly, and all at once. No more struggling with obstinant mini-pumps; no more forgetting how many pumps of resin I had made versus hardener, and wasting an entire batch rather than risk the wrong ratio.
I've already forgotten the pain of the purchase price; the pump is that good.