[AJD] Phosporic acid and cleaning a gas tank

[Dee Schuyler]

Kyle
I have used these products to seal up a pretty sad tank that I thought was 
unfixable. It has been leak free for a couple years now.
Your milage may vary
http://www.theshopproducts.com/products.html
Dee
----- Original Message ----- 
From: "Kyle Sands" <willys_46 at mail.com>
To: <antique-johndeere at lists.antique-tractor.com>; 
<at at lists.antique-tractor.com>
Sent: Friday, July 15, 2005 8:49 PM
Subject: [AJD] Phosporic acid and cleaning a gas tank


>I would never have imagined it would be so difficult to find phosphoric 
>acid.  I called all over town asking for it by name and also under names 
>such as ospho, metal prep, or metal etch.  Nobody had anything, but more 
>likely, I don't think anybody had a clue what I was aksing for...
>
> In desparation, I went to a fleet store and looked through all their 
> cleaning products to see what I could find.  I finally found a product 
> called rust destroyer or something like that and it listed the active 
> ingredient as phosphoric acid.  It cost my 8 bucks for 32 oz. but I didn't 
> care.
>
> I had cleaned out my gas tank using muriatic acid to eat away all (or at 
> least most) of the rust inside.  I then washed that solution out with a 
> lot of water and poured in this rust destroyer stuff.  I sloshed it 
> around, let it sit, sloshed it around again, let it sit, and did that 
> several times leaving it in overnight.  I poured it out the next day 
> figuring my tank was ready - sealed and protected from future rust.
>
> Wrong!  I opened it up a couple days later and rust is starting to form on 
> the walls and on the little metal dipstick.  What's going on?  I thought 
> phosphoric acid was supposed to coat the metal with a protective coating?? 
> Am I wrong, or did I mess up somewhere?????
>
> Kyle Sands <>< Alexandria, MN
>
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