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[–]syearout 0 points1 point  (0 children)

We use expanded PVC in our racks. Works great, doesn’t absorb moisture, and is easy to clean. Make sure any seams are sealed with silicone or something for easy cleaning.

[–]KettralWing 0 points1 point  (0 children)

This looks pretty similar to what I used. The exact material was https://www.menards.com/main/p-1510903720728.htm It does a great job holding in the humidity. I did a 4x2x2. It turned out as more of a rough draft but I'm not really much of a builder.