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268331 RH Hutchins <rhhutchins@h...> 2019‑04‑23 Ospho
Recently I had to de-rust and paint my BBQ smoker.  I used elecktrickery 
to get the loose rust gone then a good cleaning with toluene then a 
heavy coat of Ospho anti-rust treatment.  I had never heard of it but 
got the tip from a BBQ forum. After all was dry, I used an old towel to 
wipe everything down then rattle can painted with auto engine paint.

Now for OT relevance, I was wondering if anyone has ever used Ospho (a 
phosphoric acid based anti rust mixture) on old tools and with what 
effect?  I'm concerned that it might create that unwanted dull finish 
that other de-rusting agents cause.

Bob Hutchins
Temple, TX, USA
268333 John Ruth <johnrruth@h...> 2019‑04‑23 Re: Ospho
Bob,

IMHE, any metal treatment containing Phosphoric Acid gives steel a sort of dull
gray finish.  I’ve successfully used at least four different Phosphoric Acid
products; all of them did this.

Ospho is actually _intended_ to leave a phosphate coating.

The dull gray coating takes paint well.

It inhibits further rusting, especially if you rub some oil into it.

BTW: Over a year ago, Home Depot stopped carrying Behr Concrete Rust Stain
Remover with the Phosphoric Acid formulation.  This had been my favorite source
of _relatively inexpensive_ Phosphoric Acid.  Worked great on tools!
 
John Ruth
Sent from my iPhone

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