[rotorwrench]

The phosphoric conversion coatings are a mix of proprietary materials most of which is water for dilution of the phosphoric acid and some zinc salts to add a bit more protection. They also put a resin material that helps keep the wet portions on the treated surface. Ospho is a trade name and it is designed to be a pre treatment for structural steel prior to further priming or painting. It works better for a basic conversion coating if diluted.

Phosphoric acid converts the non inert iron oxide into the black iron phosphate which is inert. A person can use Gibbs or Boeshield spray products for short term protection but it has to cleaned off thoroughly prior to priming and painting.