I did not want to have to mow off the old spoilboard on my newly setup vacuum table so I used double sided foam vacuum tape to seal it and hold it in place.
But the downside to this is if the vacuum is not on the table is not flat. I found this out when I used another zone for the zero when cutting through a part and I could not get a full depth cut.
I thought the top had settled a bit since the setup was only a few days old. So I flattened the top only to have my two feins shut off from tripped breaker then a powerstrip trip. The flattening was far deeper in the middle without the vacuums running. So I ended up taking off extra.
But reading more do I need to remove the first spoilboard? Will the vacuum be affected going through two layers?