I have been using my vac table for a while now and my motto is always if it aint broke dont fix it. It has been holding well.
My setup is; plywood bolted to steel table frame, MDF plenum sealed with polyurethane and glued to plywood, Trupan spoilboard surfaced both sides and just laying on the plenum.
Couple things I have been wondering.. I never glued or siliconed my spilboard to the plenum. I felt that I didnt want to mess up the pretty plenum by glueing the spoilboard down. It has always stayed put, and is super simple to replace.. I re-plane it smooth until it's about 1/4" thick and then toss it off. Am I missing or risking something in regards to not glueing down the spoilboard?
I've also never sealed the edges of any of my spoilboards. I am sure I have some loss at the edges but I didnt like the idea of running duct tape around the edge as I was reading. I have some epoxy paint leftover from a job.. as long as it sticks, would that be good for sealing the edges? The reason I ask is that I remember I had to recoat the plenum 4-5 times with poly before I was comfortable it was sealed.
Thanks