Hey all, in searching around the forum it looks like some of you have used plastic, PVC or HDPE vacuum plenums for your vacuum setups.

I have a 4x8 machine with 8 zones. The work that I do is really varied so having a universal vacuum that I can switch from the full table all the way down to a small 24" x 24" zone works well for me.

You can see my setup here: https://goo.gl/photos/MUq1RJaKRV2xxrFk7

I'm getting near the point of having to replace my spoilboard again and I'm thinking of switching my plenum out for something that's made out of plastic. My current MDF plenum has several coats of glue and Shellac on it, but I can't help but think that totally non porus plastic will work even better.

For those that use plastic plenums, what did you use exactly (PVC, HDPE, something else) and if you did switch from MDF, did you notice a good performance boost?