Phosphoric Acid 85% Technical Grade - 55 Gallon Drum - Uses: PH Control and Adjustment, Corrosion Inhibitor, Activating Agent, Personal Care, Pharmaceutical, Agriculture - Made in America

I bought this product to remove rust from steel as a part of a refinishing process. It worked absolutely great! I'm very pleased.Now keep in mind, this is a liquid. It will be most convenient to use on horizontal surfaces. But, it has enough viscosity that you could probably use a cheap paintbrush to brush a thin coat on vertical surfaces too. However you do it, if you keep this material on rust, the rust will disappear.

We have been paying $100/gallon for phosphoric acid

I am applying this to a rusty trailer frame prior to sealant and painting

As advertised, little high priced

good

85% phosphoric acid, dilute for use in rust conversion. Active ingredient in many rust converters, might need surfactant mixed in, haven't researched and figured it out yet. Sturdy package double sealed cap. Delivery person did not pay heed prominent "This end up", but was still ok, did not spill

I bought the acid to remove rust on some shop equipment. I have used the acid before to remove rust on metal to be painted with rust resistant paint and it worked very will. It worked well as used on the shop equipment. Easy to clean up and neutralize.

I purchased this to etch Aluminum custom electronic control panels (aesthetics; nice uniform grey hue that decals stick well to) and as a quick "shot in the arm" to revitalize an old water softener. This worked well for both purposes after diluting with an appropriate amount of water for the metal etching and proper proportioning with the brine water in the water softener. Comes as 4 1-quart bottles and the hazmat shipping charges are a bit steep but with 85% strength this is still a decent deal.