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Old 13-06-2021, 15:07   #1
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Oxidation on mast and boom

I am looking at a 1980 True North. There is considerable oxidation on the aluminum mast and boom. I have a similar vintage boat myself and my aluminum spars are shiny and smooth. Aside from aesthetics, is this any indicator of lesser quality materials or future issues? Please see below image. Thank you!
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Old 13-06-2021, 15:08   #2
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Re: Oxidation on mast and boom

Here is the boom
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Old 13-06-2021, 16:26   #3
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Re: Oxidation on mast and boom

I would suggest you are comparing an anodized spar v a painted or powder coated spar. The aluminium boom in the photo looks to be in good condition (agree the poor paint adhesion doesn't look great), you may want to just remove the old paint and leave it bare.
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Old 13-06-2021, 17:31   #4
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Re: Oxidation on mast and boom

Diamond said it perfectly. Anodized vs none. Nothing wrong with natural weathered aluminum...it self protects.
Donít sit on it in your yachting whites..LOL...youíll end up manatee gray
Not to worry.
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Old 14-06-2021, 10:31   #5
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Re: Oxidation on mast and boom

Quote:
Originally Posted by Manateeman View Post
...............
........... Don’t sit on it in your yachting whites..LOL...you’ll end up manatee gray ......
I certainly agree; however this "manatee grey" will likely color your sails if you stow them furled on the boom as most do. For this reason I painted my booms.
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Old 15-06-2021, 21:41   #6
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Re: Oxidation on mast and boom

Both my Cavalier 32 (10m NZ sloop) mast and boom are bare alloy. The boom was painted and the paint in bad condition when I bought the boat 3 years ago. I had it sandblasted and then I immediately painted it with a 2-part clear penetrating (thin) epoxy; just one coat as a sealer. I have not had any issue with staining on the mainsail cloth, but I always put the sail gaskets between the sail and the boom, not around the boom, so the sail isn’t squashed onto the boom.
Surface corrosion on proper marine alloy is not a structural problem; just think about all those unpainted alloy French hulls.
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Old 15-06-2021, 22:58   #7
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Re: Oxidation on mast and boom

...very different alloys though...
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Old 17-06-2021, 00:02   #8
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Re: Oxidation on mast and boom

Yes, different alloys, but both are resistant to surface corrosion in a salt water envrionment.
I happen to like the utilitarian look/color of bare alloy hulls and decks. The downside of course is the problem of antifouling paint.
After years of cruising on fibreglass and steel boats, anything that reduces maintenance time/cost and hull, deck, spars is a bonus.
Of course with both alloys, one must be very careful to isolate any fittings made from stainless steel or copper-based metals...
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