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Date Posted: 09:51:33 06/16/08 Mon
Author: Bill
Subject: Re: Aluminum boat advice, etc.
In reply to: Danny 's message, "Aluminum boat advice, etc." on 05:25:36 06/10/08 Tue

Another thing to consider with an aluminum boat is invisible porosity. Some components of the alloy will sacrifice themselves before others, and some may not do so at all in the conditions the boat faced. That leaves you with a hull that looks good once you get the oxidation dandruff off, but has no strength. Microscopically, it can look like a sponge, but that isn't necessarily visible to the naked eye.

Also, you need really high tech primers (last I know of) to get paint to stick to aluminum. the surface oxidation that aluminum gets is somewhat protective, but it drops paint and primer readily. research what it takes to give those cans of primer a long shelf life. How long of a shelf life can you expect of the products you will need? Is that long enough for your cruising/escape plans?

Repairs in aluminum are tough. I have never welded on an aluminum boat, but I tend to think it is a mighty fancy alloy. Torch welding aluminum is difficult in the extreme, even with dry flux, clean rod, and the right flame. Often it is impossible (so I have found, but maybe I was ignorant of some element in my failed attempts shipboard). A tig welder or wire feed that can run aluminum is a really energy expensive proposition, and heavy as hell.

Finally, make sure your surveyor is someone other aluminum boat owners speak highly of. All the better if s/he has some metallurgical background, or experience with the stuff.

Good luck,

I hope she pans out for you.

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