Re: [GBlist] Rust stains on/in concrete

[Kerry Wilson <kerrywil@yahoo.com>]

I would try Oxalic acid first. you can get it at paint stores.  It is
the stuff used to bleach wood and is the tart flavor in Spinach.  

   
--- David Seth Melchert <dmelchert@earthlink.net> wrote:
> I use Muriatic Acid (which is 37% HCl). It is nasty material and will
> eat away
> your concrete too. You should dilute it (add acid to water, not the
> other way
> around), wear a respirator with an acid vapor filter, rubber gloves,
> and dot
> the rust stains lightly at first. If the concrete has a particular
> finish,
> this might not be the right solution, as it will probably leave
> traces of
> lighter-colored concrete. But, yes, it does remove rust stains very
> well.
> 
> Seth
> 
> Sacie H Lambertson wrote:
> 
> > Can someone tell me how to take rust stains off of a yet unsealed
> concrete
> > floor please?  I thought I understood that oxalic acid would do it,
> but
> > tried some today and it didn't.  If it is supposed to work, then
> what is
> > the solution I should be using?  Is there another product that
> might be
> > better to use?  Thanks  Sacie Lambertson
> 
> 
>
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______________________________________________________________________
This greenbuilding dialogue is sponsored by REPP/CREST, creator of
Solstice http://www.crest.org, and BuildingGreen, Inc., publisher of
Environmental Building News and GreenSpec http://www.BuildingGreen.com
______________________________________________________________________