Just some speculation on my part. I'm guessing that UV stability is better served by a paint coating over an ABS pod so Wetsounds added a protective paint coating for longevity. A polishing compound may have been a bit too aggressive, especially after years of exposure. UV protection likely breaks down eventually. And those are old speakers. Going forward, probably the best paint would be what automobiles use on flexible exterior plastic parts, like bumpers for example. You might find something in a can by SEM from an auto paint & body supply house. You might use a matching primer or adhesion promoter. Apply a non-cleaner wax twice a year. Use sox that breath and do not promote mold.
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