Mike,
I'm building an F85SR with all possible work done using a vacuum. I've put some info and pics in another forum on this sie.
Farrier suggests no greater than 22 inches of mercury, That would be around 10.8psi.

I've used a lot of west system in the past in non vacuum jobs but due to an ever worsening allergy to West I'm using Gurit (SP Systems) Resin for the F85SR.
They provide data sheets that clearly specify the earliest and latest turn on time as well as the earliest turn off time and even earliest demould time for a given hardener (fast, standard, slow and extra slow) and ambient temperature. By keeping to the appropriate Vacuum window I can pull as much vacuum as I like without starving the laminate of resin. So I aim at a the max. It may pay to see is West publish similar data sheets.

Otherwise if I were you I'd do a test run at 10.8psi and see how that goes. Farrier is unbelievably thorough I think you will find that spot on.

Regards,
Phill

Last edited by phill; 01/18/12 10:29 PM.
I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!