Phosphoric Acid 85% - Technical Grade - 15 Gallon Carboy - Uses: PH Control and Adjustment, Corrosion Inhibitor, Activating Agent, Personal Care, Pharmaceutical, Agriculture - Made in America

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

good

As advertised, little high priced

Not getting the job done as well as i thought it would

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.

Removing Calcium deposits from a Brass plaque

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.