[Public-list] Water tank cover

[Mike Lehman]

Michael,

The 'sand' is aluminum oxide on the underside of the tank lid that falls 
into the water. I did this repair over 15 years ago. My solution was to buy 
a 1/4" sheet of G10 epoxy and use the old aluminum cover as a pattern. I 
spray painted over the holes to mark the epoxy sheet so the holes would line 
up with those on the boat. I installed an inspection plate in the new cover, 
and installed the new cover with 5200 and SS screws. Those of you that have 
the newer style boat and have a water leak in the forward cabin, may 
discover, as I did, that the old tank top was leaking around the sides. 
Thats because the aluminum top was installed with rivets, and rivets have 
holes trough their centers and when the tank is full and the boat is 
pounding through waves there is a tremendous amount of force on the 
top...and it leaks. Well mine no longer leaks since the repair.

Mike Lehman
~~~_/)_/)~~_/)~~~




----Original Message Follows----
From: "Michael Grosh" <dickdurk at atlanticbb.net>
Reply-To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Subject: Re: [Public-list] Water tank cover
Date: Mon, 27 Jun 2005 06:24:20 -0400

>The original anodizing is gone so now it's just plain sheet
>aluminum.

Anodizing is just a chemical process that accelerates and magnifies the 
creation of aluminum oxide (rust, if you will). It's the oxide that makes 
aluminum so resistant to degrading because it is an airtight seal, and it 
forms almost immediately on it's own, unless interfered with by some other 
process (I understand mercury really screws up aluminum's ability to protect 
itself).

Aluminum is a component of solid rocket fuel-highly reactive.

this 'sand' doesn't sound like aluminum flaking off-it sounds more like a 
salt; some kind of dissimilar metal reaction, perhaps?

Michael Grosh
#220
BTW cured epoxy is non toxic even if you do eat it, unless you plug up an 
intestine or something.


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