Here is a link for a pressure chamber that I have been looking at building. Will this work with the cactus juice? Under say 20-25 inches of vaccum will the cactus juice penetrate to the core of a 2x2 blank?
http://content.penturners.org/library/tools_and_jigs/pressurepot.pdf
Depending on your elevation above sea level, 20-25" may not be enough vacuum. The maximum theoretical vacuum at sea level is 29.92" Hg on a standard atmospheric day. It is not possible to achieve 29.92" Hg at sea level, even in the most perfect laboratory setting. However, with a good pump and chamber, you can get close, say 29.9" Hg. For every 1,000 feet above sea level, you loose 1" of potential vacuum. So, for example, if you are in Denver at 5,000 +/- ft. above sea level, you maximum theoretical vacuum would be 25.92" Hg so a 25" Hg vacuum would be a good vacuum. Remember, the definition of a perfect vacuum is the absence of all molecules (air). The more air you can remove from your blank, the more resin you can get into the blank. Consider that 25" Hg at sea level is only a 83.5% vacuum(25/29.92), then the most air you will be able to remove from the blank at best is 83.5% of the air. It will work, it just will not be the best stabilization you can get.
I wrote an article on vacuum and how it relates to stabilizing. You can find it at
www.turntex.com/vacuum.
Please be aware this article is on my commercial website. This is not intended to be an advertisement or an attempt to get people to my website. It is just easier to link it than to try to copy and past it here since it has pictures included.