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my setup is an old legostina pot, a silicon baking sheet cut for a gasket, and this piece of polycarbonate 6009 Polycarbonate Clear 1 2"Thick 12" X 12" FOR Sale | eBay

The hose and fittings I got...

Very good point. Also depending on woods species as well, and viscosity of the fluid. See, I'm still learning.

I haven't played around much using polyurethane as a stabilizing fluid. I tried it on a few pieces early on, using some crude techniques that took more effort than it was worth. It looks as though...

I went through the same thing Roy. I couldn't figure out why I wasn't getting good penetration on my material. Once I read this same little tip, things got better. Another thing you can do, if you...

Looks promising Roy. Yes, weighing it down so that it's submerged is key, as you probably found out. That way the entire piece can take in the fluid. Other things I have read about stabilizing that...

That's really good Roy. I have a big one I made with an actual vacuum pump and it pulls 27/28 inHG. I'd say for a small setup, the 24/25 your pulling is really good. Should be good enough for thin...