I'm doing my deck too.
I cleaned the scale and coated the metal w por 15 paint.
I will put a layer of aerospace sealant between the 2 pieces and fillet seal all the edges. I get expired material which is still usable.
I sealed the water pump style bearings in the housing too. A bit top and bottom plus around the 2 halves. WI'll put the bearings on the deck the same way.
Probably use some lead sealant on the threads or loctite.
Big flacky rust is normal. If you can keep the grass and water out, there will be no more rust. Cauk around the edges maybe.
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