Survey issues - with pictures

[Boatyarddog]

I'm replacing bulkheads on my Mariner 32 now, so far, 1 complete one and 3 areas on the lower ends of 3 more, water leaks from the deck seam.
Never attended to by the prior owner.


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[Tessellate]

Ok, one more pic.
This is a photo of a gooseneck at the boom to mast attachment. The gooseneck had obvious serious wear / corrosion - the top edge is worn and there was flaky metal stuff below it I could pick up with my finger.
But what are the white dots on the boom? I could wipe them away with my finger and they're like a fine dust, without any pitting behind it that I could see. I've seen this on old boats before. Is it oxidation of the aluminum? Or galvanic corrosion?

[Boatyarddog]

Oxidation crystals from the aluminum, powdery white.
This is not anodized aluminum pretty common.
Remove the boom, sand, seal and paint it or have it powder coated.
When using stainless on aluminum, use lanacoat on the screw heads prior to installation.
Anything that touches aluminum, that is stainless.


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[Boatyarddog]

It's part galvanic because of the dissimilar metal attachment.
The spots do cause some pitting at the surface level of the boom.
Sand and seal. Paint the boom. Or mast or whatever.
You could try to polish it out, short lived, and wax.


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[jongleur]

That split pin appears to be missing a leg.