There are types of grease additives, solvents and other organic substances
that cause synthetic plastics and rubbers to fail, including by puffing
up. Until you will know what that grease contained there will be no way to
know if it killed your parts. My suggestion: take a new capacitor of the
same kind, put some grease on it, and seal it in a small box for a few
months (maybe in a warm place). Then inspect it.

There is a REASON for not using just any conformal coating off the shelf
without testing over time. Same for solvents, oil, grease, etc. More
serious firms have people who run these tests and compile lists of
'tested' supplies.

Peter

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