By saying that you should be potting the holes in epoxy, doesn't mean that you shouldn't be using a good sealant for the installation. The use of the epoxy isn't to provide a water-tight seal for the installation, but to protect the core from water intrusion and prevent a much more problematic repair later on. Boatlife or 3M 4200 are probably good choices, but it really depends on what the speaker and grill are made of. Some sealants and plastics don't play nice with each other.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.