The Resin Infusion guide on this site recommends clamping off the vacuum line once resin starts flowing into the catch pot, but other sites recommend leaving the pump running until the resin reaches initial cure. It looks like either will work. Clamping the line prevents too much resin being drawn out of the part and avoids the risk of an exotherm in the catch pot, but if you have any leakage you are going to lose vacuum and the part will be ruined. Leaving the vacuum pump on for hours whilst the part cures is going to be harder on the pump but provides some insurance against minor leaks and presumably minimises the amount of resin left in the part (giving a stronger part for less weight as long as it doesn't resin starve)...

What do you do, fellow forum members?