What Rust Converter should I use?

So when should I be using a rust converter?

You should use a rust converter when dealing with metal surfaces that have developed rust but are not structurally compromised. This typically applies in situations where rust is present, but full rust removal (through sanding or blasting) is impractical or too costly. Key instances to use a rust converter include:

Surface rust on vehicles – When you notice minor rust on cars, trucks, or trailers, a rust converter can neutralize it and prepare the surface for repainting.
Metal structures or equipment – Buildings, fences, machinery, or tools exposed to moisture can develop rust over time. Applying a rust converter prevents further corrosion.
Marine and outdoor applications – Rust converters are valuable for protecting ship parts, bridge pylons, and outdoor metal surfaces frequently exposed to the elements.
Preventative maintenance – If you anticipate further exposure to moisture, using a rust converter as a primer can help stop rust before it progresses.

Using a rust converter is a quick, cost-effective way to halt corrosion without requiring complete rust removal.

Rust converters are essential tools for tackling corrosion on metal surfaces. These products chemically react with rust (iron oxide), converting it into a stable, protective black layer that prevents further oxidation. Unlike traditional rust removers, rust converters don’t strip away rust but neutralize it and act as a primer, providing a smooth base for painting or coating. Rust converters are especially useful for restoring vehicles, metal structures, and equipment that have been exposed to moisture and are showing early signs of corrosion. They are a cost-effective solution when sanding or full metal replacement isn’t practical.

So what rust converter would we recommend?

Tergo Blackguard is a specialized rust converter and primer that is particularly well-regarded for its ability to chemically transform rust into a stable, black, corrosion-resistant layer. It is widely used in automotive repairs, building steelwork, and other metal surfaces exposed to the elements. The product is a liquid that can be applied using a brush, roller, or spray, making it versatile for various tasks.

One of its key features is that it acts both as a rust converter and as a primer, meaning it not only halts corrosion but also creates a base for subsequent paint or coating applications. The low permeability of its vinyl-acrylic copolymer composition prevents further rust by limiting water vapor and oxygen penetration. Its effectiveness across a range of environments—from cars to bridge pylons—makes it a go-to solution for maintaining metal integrity.

Another option – CRC Rust Converter 1L

The CRC Rust Converter is a fast-drying product designed to neutralize rust and convert it into a tough, black primer in a single step. It binds to rusted surfaces, creating a waterproof barrier that prevents further rusting. The converter is easy to use, doesn’t require any mixing, and eliminates the need for extensive sanding or scraping. It’s particularly useful for treating lightly rusted surfaces on vehicles, machinery, or household items such as gutters and railings. However, it’s not recommended for heavy rust scale, as it might not fully prevent future rust in those cases.

For best results, it’s advised to allow at least 12 hours of cure time before painting, ideally with an enamel topcoat.