Anything with a wood-melamine base, such as shelves and drawers, needs to stay dry. In just about every undersink area I’ve had in my home, the shelf had to eventually be removed due to swelling in the melamine.
If wood-based products are your only option, try to seal the edges as well as possible, or store only dry items in this area. Wood-based drawers are generally expensive, so you want to avoid the replacement costs.
Tip: There are specialized products on the market that look similar to melamine but are made with synthetic and completely waterproof materials. Do your research and talk to a cabinetmaker if you’re looking for a durable and waterproof solution.
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