Marble Rust Stains a Challenge for the Stone Fabrication & Maintenance Industry

The Marble Institute of America currently states that rust stains on light color marble are virtually irremovable and that they have no recommendations for removal. Unlike other stone, marble is a metamorphism of limestone, a very soluble stone. This property makes marble sensitive to many types of chemicals and makes the rust stains almost impossible to remove or leaving the surface deeply etched and marred.
One of their members, a Stone Fabricator himself, was confronted with the task of trying to remove rust from a polished White Carrara Marble. He contacted TheRustStore.Com and asked about using Concrete Rust Remover. Although we had tried it on many natural stones and found great success with no dulling or discoloring at all, we hadn’t had anyone try it on marble and therefore couldn’t recommend it. Eagerly seeking a solution he had us overnight a container to try.
Here’s how he applied the product: he applied a light coat and left it on for around 4 minutes. He noticed that it started to work, but that after 4 minutes it started to etch the surface, so he washed it off. Seeing some success in removing the rust, he then applied a second coat and after 4 minutes washed that off also. After the second application, he had complete success and removed all of the rust from the marble without marring the surface.
Will it work in every situation where rust has stained marble? Probably not, but It’s a possible solution worth considering.