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