James,
Various "metal prep" chemicals are phosphoric acid-based (probably with some
surfactants--i.e. soap--added in). Try Googling "metalprep" or "metal
prep."
Here's a popular one:
http://www.aircraftspruce.com/catalog/cspages/improvedmetalprep.php
Note it gets diluted before use (but you can use it full-strength, too).
FWIW, "Naval Jelly" contains phosphoric acid, and I've heard that Coke
(the legal kind ;)
has mild (obviously) phosphoric acid content and is a good rust remover
(I'd stick with
metal prep, though).
bs
JAMES STONE wrote:
> I have a set of gas tanks that I am cleaning and re-sealing. I intend to use
> Hirsch Gas Tank Sealer, which comes highly recommended. Based on
> recommendations from a friend, I cleaned the tanks using muriatic acid, which
> worked like a charm: 40 year old tanks came out looking like they'd been
> sandblasted. However, it is necessary to wash out the acid with water, which
> then caused the tanks to immediately flash rust. That was expected, and I had
> a pint of Hirsch's Gas Tank Etch
> (http://www.hirschauto.com/acb/showdetl.cfm?&DID=27&Product_ID=7&CATID=3)
> standing by. It should have removed the flash and etched the tanks prior to
> sealing. However, they came out pretty patchy. I wasn't at all happy with
> the result and didn't want to seal an improperly prepped surface. I suspect
> that one pint wasn't enough, but that stuff gets pretty expensive when you add
> shipping in and I think it is basically just phosphoric acid. I used to be
> able to buy phosphoric acid pretty easily 30 years ago, but can no longer find
> it. Does anyone know a place where this can be found easily and
> inexpensively? If not, is there a good substitute for it? Or, should I just
> bite the bullet and buy several pint bottles from Hirsch? Thanks.
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Bob Spidell San Jose, CA bspidell@comcast.net
'67 Austin-Healey 3000 '56 Austin-Healey 100M
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