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I do like the idea of doing the vac treating of the almost finished item. that way you get max penetration if the wood doesn't want to accept the resin and minimum waste.

I'm doing a large job...

spar varnish with japan drier

first batch of scales ready for the vacuum chamber: walnut, mahogany, bubinga and padauk

as found: Photo

last night I spent a couple of hours making a retainer ring for the gasket that would spread the gasket tighter the harder the vacuum. made it from mdf. came out this am. and gave it a quick coat of...

the problem with PVC is brittle failure. it may be able to handle the pressure under perfect conditions but a knock or bump under pressure can set it off then it shatters into sharp bits which go...

what kind of polyurethane do you use?

it's an older one, from a thrift store. it has a rubber seal, though, and I see what you mean- there's nothing to keep the gasket from being sucked in. drat.

bought a pressure cooker yesterday. I'm going to play around a bit with vacuum impregnating wood scales. first I'll experiment with thinned varnish/japan drier.
I figure if I can find a mix that...