Hi Ron - don't be hard on yourself.  I'll take all the advice I can get :-)  I had just heard that using phosphoric acid would protect the metal for quite some time so that the tank wouldn't need to be coated with some kind of a liner before use.  In other words, you could let it sit for awhile before using it.  The rust converter products I don't think would work so well in this application because you can't control where the product is applied.  I had thought about just dropping in some 30wt oil and letting that sit in there until the tank is ready to get back into action.

Kyle

> Kyle,
> 	I have used Metal Prep, a DuPont product, and similar acids to 
> remove rust and prepare ferrous metal pieces for painting.  Flush 
> with water, forced air dry and paint immediately.  If left 
> unprotected for very long, rust will form as things are really 
> clean.  Maybe you are thinking of parkerizing, which is nothing 
> more than black colored rust, I think.  WWII gun barrels.  I 
> believe that process takes heat, though.
> 	I once used some product called rust converter or something on an 
> old rusty Ford car.  You applied it on the rust and it turned the 
> rust black.  Supposedly you could then paint the part and rust 
> would not reappear.  It seemed to work for several years.  I do not 
> think any of this is what you were trying to accomplish though.  
> Clean that tank again and slosh it with oil.  That will hold it 
> until you start using it for gas again.  Not much help, am I?
> 
> Ron Cook
> Salix, IA
> 
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