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Hi Folks,

??? I need some advice.? I've been working on making a vacuum press table.? I put together a torsion box and attached a melamine top to it.? I CNC cut channels in the melamine to allow the vacuum to flow.? What I had not adequately considered was how porous the particle board is.? My vacuum pump is running continuously, and while the plastic sucks down, I never get over 1" of mercury.? It seems a lot of the issue is just the airflow through the particle board.? Any recommendations on the best way to seal the exposed edges of the melamine and the grooves in the top?

??? Some of the stuff I've seen online has suggested oil-based poly.? Other suggestions have included glue (all types), and Gorilla spray sealant.? Thoughts?

??? Note:? The photo below doesn't show the gasketing (applied to the melamine in two concentric rings that align with the extrusion) or the polyurethane vacuum bag (applied to the extrusion).