That's odd. It's the mayo that needs to be refrigerated. BUT if you add onion, it's best to refrigerate your egg or potato salad for awhile so the flavors blend.
We originally used French's yellow mustard when I was a kid. But once on a vacay in Vermont, we went to climb Mt Mansfield (not a very high mountain) and on the way, stopped for lunch. I had a hotdog, and the waitress brought Grey Poupon mustard.
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