Don't Remove Rust, Convert Rust!


Not all rust converters perform equally. Corroseal Rust Converting Primer was formulated specifically for use in the marine industry – one of the harshest environments for coatings. There are considerable differences in formulas and performance between the various rust treatment products in the market. Corroseal has proven performance for over 25 years in harsh environments, which is not true for many competing rust converter-type products.


It’s important to remember that rust never sleeps!

Rust converters chemically treat the rust – converting it into an inert compound – which then acts as a barrier layer against future rusting. Therefore when using a rust converter, especially Corroseal, you are adding a double layer of protection against future rusting before you even topcoat.

Rust encapsulators & inhibitors encase existing surface rust, cutting off the oxygen supply that keeps that rust from growing. However, the existing rust is still there lurking under the encapsulating film, ready to continue growing upon any surface damage to the paint film or film failure.

Acids used for treating rust are by nature corrosive, and any unreacted acid residue will remain on the surface. This residue frequently interferes with the proper bonding of topcoats and can cause accelerated chalking. Acids, such as phosphoric acid, do work well to remove rust stains from painted surfaces, but are not as effective as rust converters on a rusted surface.


Corroseal is a water-based rust converter combined with an unpigmented high-quality copolymer latex metal primer. The advantages of using Corroseal include reduced labor costs by not having to mechanically or chemically remove existing rust while at sea, on bridges, or in operational factories; and by the environmentally friendly properties of the product which makes delivery, storage, use, cleanup and disposal relatively convenient when compared to other metal primers and rust removal methods.

Corroseal is non-flammable, non-corrosive, easy to apply, and cleans up with just soap and water.

Corroseal works equally well applied by an inexperienced homeowner or by a professional shipyard painter.


Corroseal converter chemistry is a proprietary technology based on very mild acids combined with an unpigmented, improved metal primer, a copolymer created from styrene butadiene (latex) chemistry.

Corroseal is designed to apply directly to clean tight rust. The first bloom of rust after water blasting is a benefit.

The effects of Corroseal are created by its two principal components:

  • Mild acids to arrest rusting and convert existing rust to other compounds
  • A chemically advanced copolymer that bonds with both the converted rust and with applied topcoats.

Corrosion (rust) is simply metallurgy in reverse – meaning that it’s nature’s way of returning steel back to its original ore forms. The process of corrosion in the field (outside the laboratory) does not occur in a nice uniform growth, and the actual formation of rust is a very complex 5 step process. You can learn about rust and how it works here.

Additionally, all commercial steel contains impurities, which are not uniformly distributed in the metal. Understanding the chemistry of corrosion and effectively dealing with many of the irregularities that are present on a particular steel surface is what makes Corroseal Rust Converting Primer better than other formulas.


Corroseal remains “open” to mechanical, chemical and electrical bonding with most topcoats for 30 days. Corroseal is well known as a high-quality and consistent product by those who routinely deal with painting rusted metal. Corroseal serves as the primer and bonds with oil-based paint, epoxy, urethane and most other top coats.