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Paint over Rusty Metal

Using Rust Doctor on Metal

How to stop rusting on metal and make it look like new

Virtually all standard paints require the removal of rust before surfaces can be primed and painted. With Rust Doctor, rust does not need to be removed. Rusty surfaces only need to be cleaned before they are treated with Rust Doctor. This saves a great deal of time and effort in the repair and maintenance of metal surfaces. In addition, Rust Doctor incorporates a latex primer that dries on the surface, allowing for the application of a topcoat. The Rust Doctor converts the rust and primes the surface, all in one easy step. It's how to stop metal from rusting and make it look like new.

Prepare the rusty metal for treatment
Using Rust Doctor is very easy. Clean the rusty surface to remove any loose rust and scale. This can be done with a wire brush, power brush or grinding wheel (Illustration 1). On large surfaces this can be done with high-pressure washing.

Clean the surface to remove any surface contaminants such as dirt, grease, oil and road salt. This can be done with a water-based degreaser such as the Grease Doctor or on small areas, alcohol and a shop cloth. (Illustration 2) If you are pressure washing, add the degreaser to the pressure washing water. If road salt is present, use a desalting solution such as Salt Doctor to remove road salt.

Apply Rust Doctor to the rusty metal
Be sure surface is dry. Apply Rust Doctor with brush or spray system. Apply enough Rust Doctor to cover the rust completely. Do not allow any rust to show through the surface. If necessary, apply a second coat of Rust Doctor while the first coat is still tacky or after 24 hours (Illustration 3). In a few minutes, Rust Doctor begins to convert the rust, turning it black.

The conversion process turns the rust black as it changes to magnetite- a very hard form of iron oxide. This hard surface protects the metal from future rusting and is not affected by moisture or oxygen. After the conversion process is complete (in 16 to 24 hours), the surface has turned completely black and has a slight sheen (Illustration 4). This sheen is the result of the latex primer that remains on the surface. The primer creates an excellent base for any kind of kind of topcoat. It is not necessary to top coat if the surface will not be exposed to direct sunlight. Typically in automotive restoration, leaving floorboards, frames, drive train components and interior surfaces Rust Doctor black is very effective.

Obtaining a smooth surface
There are various ways to obtain a smooth surface when using Rust Doctor. You can sand the rust to a smooth surface (it is not necessary to sand to bare metal). If, after applying the first coat of Rust Doctor, it still is not as smooth as you would like, a second coat can be added to achieve a smoother surface. Another and perhaps easier method is to use sanding primer on the metal after the Rust Doctor has dried. Sanding primer is a fast drying paint that fills and smooths surfaces effectively. Because it dries quickly, successive coats can be added in a short period of time. Sanding between coats helps to smooth out the surface. This is the method used by body shops to achieve a smooth surface before applying final coats of paint.

When you have achieved a surface that is as smooth as you desire, you can top coat with any type of paint. Specifically, Rust Doctor will accept enamel, alkyd, oil, vinyl, latex, epoxy, urethane and lacquer topcoats. Most body fillers will work as well.

Easy water clean-up!
Clean-up with the Rust Doctor is very simple. Because Rust Doctor is latex based, it is only necessary to use soap and water to clean your brushes or spray equipment (Illustration 5). Should you get Rust Doctor on an adjacent area, wipe it off with a wet rag. If the Rust Doctor has dried, it can be removed with lacquer thinner. Be sure to keep Rust Doctor in a place were it won't freeze.

Fixing automobile rust
Rust Doctor can be used on a wide variety of projects. All phases of automotive repair and restoration require the need to deal with rusty metal. Using the Rust Doctor to stop rust and seal metal surfaces can save time and money. This is especially true when treating vehicle undercarriage frames and components. For interior use, Rust Doctor can be sprayed inside door frames, behind dashes and on floorboards.

Farm and agricultural applications
The agricultural industry has discovered the many uses for Rust Doctor. Farm equipment is exposed to a rain and snow as well a variety of chemicals. Rust is a constant problem that can be easily and quickly dealt with by using Rust Doctor.

A cure for rusty propane tanks
Many propane companies now use Rust Doctor to paint rusted propane tanks. Rather than spending time and money sandblasting and priming rusty propane tanks, they now pressure wash the tanks and treat them with Rust Doctor. Topcoating with epoxy or enamel provides years of protection with lower maintenance costs.

A safe, non-toxic, water-based latex formula
Because Rust Doctor does not emit dangerous or obnoxious fumes, industry finds it useful to treat rusted equipment and facilities during business hours without disrupting production schedules. With its latex base (no acids or solvents), Rust Doctor can be used safely around other employees.

Rust Doctor is truly the most effective and safest way to deal with rusted metal.

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Cleaning rust with a wire brush

1. Clean the rusty metal surface to remove any loose rust and scale.

Cleaning with rubbing alcohol

2. Clean the surface to remove any surface contaminants such as dirt, grease, oil
and road salt.

Cleaning with rubbing alcohol

3. Apply enough Rust Doctor to cover the rust completely. Do not allow any rust to show through the surface.

Rusty Metal Painted with Rust Doctor

4. After the conversion process is complete (in 16 to 24 hours), the surface has turned completely black and has a slight sheen

5. Because Rust Doctor is latex based, it is only necessary to use soap and water to clean your brushes or spray equipment

 

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