What would the cost difference be between epoxy and vinyl ester? Significant when doing an entire boat?
The vacuum level is controlled with a shut-off valve that may be installed anywhere in the line between the pump and the pressure pot or catch pot. You can control the amount of suction with this valve by bleeding off some pressure at the pump and closing the valve. Alternatively you could install a bleed valve in the line and this would allow pressure to bleed off while you are pumping.
In my working days I did some epoxy infusion. We always outgassed the epoxy before drawing it into the product. I do not see any mention of degassing the above comments. Do you out gas the epoxy in a separate step or is that not necessary?