Blackened Rust for a Paint Free Finish on Cast Iron
Cast iron gets tougher by rusting, and a beautiful black iron patina can be created by converting rust to a durable black iron patina finish. Mature rust on cast iron is a protective coating and blackened rust forms an attractive, lifetime paint free finish on cast iron. Save the planet and skip the paint with cast iron from Richmond Iron and a blackened rust patina using Black Max from Rhomar Industries.
Blackened Rust for Interior Installations
Blackened rust is a durableĀ patina finish for interior cast iron. Blackened iron emulates the natural black iron finish of wrought iron and hot forged metal and is a good choice for historic re-development projects.
Three Steps to Black Patina Finish with Black Max

Step 1
Force rust cast iron by exposure to water and weather. Requires 2 to 6 weeks to develop a good coating.

Step 2
Apply Black Max solution to rusted cast iron. Wire brushing rust and applying multiple wet coats darkens conversion.

Step 3
Black Max is a water based solution and dries to the touch in 30 to 60 minutes. Black Max is ready for service or traffic in as soon as dry.
Technical Documents and Product Brochures

Neenah Foundry No-Paint Policy
A technical brochure from Neenah Foundry promoting the benefits of unpainted municipal castings

Black Max Product Brochure
The product brochure and technical data for Black Max rust conversion product

Black Max Application Tip Sheet
Instructions for using Black Max