Cecil - whatever protective coating this tank had before I got after it was long gone.  The rust was already pretty thick in there, which is why I used muriatic acid in the first place.  It did a good job, too!  I had just heard that phosporic acid would leave a protective coating which would negate the need to put in a tank liner.  It won't be a big deal to put in more muriatic acid to clean the tank again and then slosh in a tank liner.  I had just hoped to avoid the liner.  Oh well...

Thanks,

Kyle

> There is an epoxy type coating for gas tanks that is sold by the antique  car
> restorers...  POR-15 had a product that worked, it formed a liner in  the
> inside of the tank.   You have cleaned the inside of the tank so  
> well that it is
> going to rust.  Fuel tanks are made from a metal called  galvaneal and it has
> a coating ( a few thousandths ) that keeps rust from  forming.  If
> youcleaned it with muriatic acid, the coating is gone,  the 
> phosphoric acid only
> cleaned it further.  I would recommend using a  baking soda 
> solution or ammonia to
> neutralize the acid, then when it is  completely dry use a POR-15 gas tank
> sealer or another type....
> 
> Cecil in OKla

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