[Public-list] Water tank cover

[Brian and Elaine Timmins]

  It makes sense that the aluminum cover is the cause. Just cleaning or
scraping it will only delay the continuation of the problem. The Aluminum
will oxidize again (quickly this time) and the "sand" will start to
reappear. The original anodizing is gone so now it's just plain sheet
aluminum.
 You need to remove the aluminum cover. Scrape and clean the surface. Use
something like West System Aluminum Etch Kit (#860), to thoroughly clean and
prepare the surface. Then coat the aluminum with straight epoxy. Let it cure
thoroughly, and apply a second coat (after eliminating the amine blush). Let
that cure completely (and remove the amine blush again) before reinstalling
the cover. This will eliminate the problem for years again (like the
original anodizing did). Don't worry about the new epoxy surface. When it's
thoroughly cured, it's not toxic anymore (unless you eat it).
Regards,
Brian   ex#497
----- Original Message ----- 
From: "Gordon Laco" <mainstay at csolve.net>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Sent: Sunday, June 26, 2005 7:54 AM
Subject: Re: [Public-list] Water tank and keel


> Interesting discovery David -
>
> I found what I thought was a lot of sand in mine too and wondered how it
got
> there...
>
> Despite what I thought was a thorough cleaning episode and replacing the
> hoses our water still comes out at the galley dirty and even a little
fizzy
> after it has lain in the tank a while - can't fathom what the heck the
> problem is.
>
> Gord #426 Surprise
>
>
>
>
>
>
> > That is perculiar...  I confess, I have never measured the tank myself;
I am
> > working from memory here.  I feel sure I have found something on line
which
> > gives the correct figure.
> >
> > Are there any signs of the area having been modified?  I assume you have
an
> > inspection cap in the tank.
> >
> > Incidentally and not a reason to influence capacity, I cleaned out my
tank
> > recently and was intrigued to find in the bottom a quantity of what I
first
> > thought was sand, but realised was some form of shell.  I found that the
> > cause of this was not pollutants aquired during filling, but a
crustaceous
> > growth on the aluminium ceiling of the tank.  There was a reasonable
amount
> > there; certainly enough to require a scraping blade to get rid of it.
Had I
> > not queried the existance of the sand, I would not have even thought to
> > check the tank ceiling when I was cleaning it out; classic out of sight,
out
> > of mind.  In retrospect it makes perfect sense to check there, but if,
like
> > me, it never crossed your mind, do have a look there.
> >
> > Cheers,
> > David
> > Kalitsah 440
> > Sydney, Australia
> >
> >
> >> From: <p.a.amos at tesco.net>
> >> Reply-To: Alberg 30 Public List -- open to all
<public-list at alberg30.org>
> >> To: <Public-list at alberg30.org>
> >> Subject: [Public-list] Water tank and keel
> >> Date: Sun, 26 Jun 2005 6:09:14 +0000
> >>
> >> Thanks gentlemen,now I have to wonder why starting from empty it took
only
> >> three 3.5 water jugs filled to about 5 gallons each to fill the tank to
the
> >> brim.
> >> Pete
> >> TaitTait #478
> >>
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