You want waterproof I suppose.
Cork/rubber gasket material is tough and resists most liquids. https://www.autozone.com/sealants-gl...heet/67680_0_0 aslo 1/16" which may be better. https://www.autozone.com/sealants-gl...heet/67679_0_0
Glue it down.
For wood studio cameras I have used adhesive backed felt. https://www.mcmaster.com/#felt/=1dfrild
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