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Old 10-04-2012
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Re: Cleaning/Polishing Portlights

Originally Posted by SVTatia View Post
Kelleyg - Please see reply # 9.

These are definitely cast - and they are not SS (cast stainless? - no).
Cast aluminum should not be powder coated - it does not accept this type of finish, the heat pushes out trapped air that creates air bubbles and destroys the finish - I have tried this and it did not work, it was hell to remove the coating after the failed attempt. Polish and re-anodize or paint as explained in reply 9.
Not entirely true.

Yes, this is a common problem with powder coating companies who are unfamiliar with coating cast aluminum, but not all powder coater's are created equal. This is why I emphasized (in bold) the "marine, three stage" system. RMC here in Seattle is an approved applicator for the USCG. They are experts in the coating of all types of metals, including cast aluminum. If your powder coating company is unfamiliar with the coating of cast aluminum, move on to somebody who is.
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