This may be the same stuff mentioned earlier. Home Depot sells a Klean Srip product called Phosphoric Prep & Etch. Barr is the manufacturer. It is used full strength for rust stripping. 1 part water to 3 parts Prep & Etch for phosphating. 1 part water to 4 parts Prep & Etch for comncrete etching.
When using it for phosphating, iron phosphate is formed on the surface of the metal which promotes paint adhesion and also thickness. It is important to wash the part well after phosphating to remove residule materials and to thourghly dry the part before painting. The iron phosphate grows on the surface of the metal like little Chritmas trees and really holds water. If dried properly these same growth structures provide a place for the paint to bond. Something like painting a rough sawed board.
I have painted test samples with and without phosphating and can see a difference when scratching the painted surface.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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