iIn canada we can get a product sold by GM auto dealers that is called silicone emulsion. I'm in the autobody industry, and we use this stuff to swell and revitalize rubber door weatherseals on cars and trucks. It would most likely work well on grommets and seals. it's heavy on the silicone, so I'm sure it's waterproof. it comes in a small 3 oz plastic bottle with a dauber to spread it around.
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