Muriatic acid is the only common acid that evaporates; they all dissolve in
water. I think the EvapoRust works great and no worries about pH before it
goes down the drain.

Threads look like burrs to tumbler media, so if the media is aggressive
enough to be removing burrs that size they will flatten and smooth the
threads, too. Polishing media shouldn't do any damage.

-----
Regards,
Carl Ijames

"Ignoramus20711" wrote in message
...
On 2010-05-11, Karl Townsend wrote:
Phosphoric acid is a better choice. It leaves a surface just like a
primer
coat on the metal. Actually retards further rusting. its the active
ingredient in many rust products from naval jelly to rusty metal primer.
Buy
it as "lime away" for $4/gal at farm fleet stores.

That would be a good excuse to go to a Farm and Fleet store. Does it
evaporate, like muriatic? I suppose I can dissolve it in water?

i