I have a used ortho with a similar problem.
Not sure how to clean the inside, and uncertain what I might put on those surfaces to protect them.
This may sound odd, but I have contemplated using a light coating of aerosol furniture polish on a rag, then rubbing it into the porous surface.
. . . but I'm looking for a better answer.
The paint on the outside has flaked off in areas, and the aluminum (?) is chalky underneath.
I don't think regular flat gray primer will really stick, but at least the outside is far less worrisome than the inside. -
Maybe one of our metal masters will have a better idea, but I thought the one and best way to protect aluminum, was with a
zinc chromate coating.!.?.
As a primer, that is... if you want to hard anodize, that'd be far better.
Why the hell are these feeds not coated or protected better.?.!
Mine's a C-band only, Chaparral.