Originally Posted by tbone587
You should either spray paint them black with a few coats, or seal them with resin.
Are these being sealed for moisture reasons?
This is part of the reason I personally am not a fan of particle board anywhere moisture is close by. A sub box is ok, but door interiors see a ton of moisture. I think plastic adapters, although less than ideal from a rigidity-seal standpoint, are a better route and is why I stuck with the OEM adapters. In 50 years you'll pull my adapters out and they'll be the same. No matter what you do to particle board, there's decay eventually. Even pressure treated redwood breaks down eventually
Resin sounds like a good route, but at that point.... you've spent more time and effort than using the OEM or similar plastic adapter.