In a rack, the area that needs most protection is the ceiling above each box.

Realize that because the rack is so enclosed, you need to use a sealer that cures quickly and is safe.

IMO the best approach is a coat of shellac to seal the wood somewhat, then sand it smooth. Shellac cures quickly and is completely safe once cured. One (or two) coats will seal in the plywood glue and wood oils. Then on each ceiling (turn rack upside down), lay down some contact paper. The paper can be replaced as needed.

Others have used adhesive-backed vinyl sheeting to do the same thing. I used thin styrene sheet plastic before. Gets costly but does the job. The contact cement did smell however, whereas contact paper does not smell.

If you want to get fancy adhere Formica to each ceiling.
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Mark

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