[newell_0]

Sayed,

Ospho, brand name for a dilute solution of phosphoric acid, is very easy to use to kill rust.  Ospho reacts with ferius oxide turning it into ferius sulfate, an inert salt.   Just smear it on to the rust.  When dry, you are rust free and primed, ready for the protective coat of your choice.

Used for years with good results always.

Interesting! I hadn't heard of the Ospho brand of phosphoric acid. Thanks for the great info!

Sayed