Rust Converter Frequently Asked Questions

GEMPLER'S Rust Converter FAQs
Below find questions and answers to our most frequently asked questions about GEMPLER’S Rust Converter. If you need further assistance, or have other questions not shown, please contact our Technical Product Support Department at
1-800-874-4755 or send them an email by
clicking here.
Before and After Photos of Rust Converter
What is Rust Converter?

Rust Converter is a synthetic polymeric formula that converts existing rust into a moisture free, black protective coating. Not only does it eliminate existing rust, but it seals out moisture to prevent the possibility of future rust formation and corrosion. Surfaces protected with this primer and an oil based paint resist the effects of weather, sunlight, rain and even salt spray without peeling or cracking as long as the oil based paint is maintained per manufacturer's recommendations. Rust Converter provides an excellent base primer for oil base and epoxy paints. This easy-to-use product is the first step in providing long-term protection of steel and iron surfaces.
Does Rust Converter have a shelf life?

Yes. Rust Converter must be used within 9 months from the date of purchase. The shelf life applies to the product even if it has not been opened.
What is the coverage area for one gallon of Rust Converter?

One gallon of Rust Converter will cover approximately 500 square feet of a smooth, non-porous surface. Irregular, porous or textured surfaces may require more product.
What objects can Rust Converter be used on?

Metal buildings, cars and trucks, machinery, gates, tanks and farm equipment. Rust Converter works on any rusty iron or steel object.

Q: Can Rust Converter be applied to a wood stove?
A: No. It is not considered to be heat resistant.

Q: Can Rust Converter be applied to a non-rusty surface?
A: No. Rust Converter should only be applied to the rusted areas, not the whole surface. After the Rust Converter has completely cured, it is recommended to wipe the surface with a damp cloth to remove all excess Rust Converter before you apply the oil-based paint. Rust Converter will glaze coat the non-rusted areas causing the paint not to adhere to those areas as well.

Q: Can Rust Converter be applied inside a tank?
A: Yes, as long as it is treated as the primer only. You must paint over Rust Converter with a paint that is resistant to the contents in the tank.

Q: Can Rust Converter be used on Galvanized Steel?
A: Yes, as long as there is rust present! Galvanized is defined as a piece of metal that is coated with zinc to prevent corrosion.
How should you store Rust Converter?

Ideally, Rust Converter should be stored at room temperature out of direct sunlight. It should be protected from freezing or temperatures above 100 degrees F. Failure to follow storage instructions will cause this product to gel and become unusable.
What is the optimal temperature at which Rust Converter should be applied?

Rust Converter should be applied when the air and surface temperature is between 50 and 100 degrees F. Do not apply in direct sunlight or in very damp conditions.
What preparation is needed before Rust Converter is applied?
A: Remove large rust and scale particles with a wire brush, hammer or sandpaper. Then clean the surface thoroughly to remove dirt, dust and grease. Allow the surface to dry completely before applying Rust Converter.
What personal protective equipment is recommended when applying?

Goggles and gloves are recommended because it may cause eye and skin irritation. It may also stain your skin. Also, if allowed to dry on your clothes it will stain.
Is Rust Converter U.S.D.A. approved?

No. Do not use Rust Converter where it will be in contact with foods or human water supply. You may use the Rust Converter inside a tank, but you must paint over it with a paint that is resistant to the contents in the tank.
How should Rust Converter be applied?

For the best results, brushing on is recommended. For larger surfaces, pour on surface and spread with a broom, mop, paint roller or squeegee.
Can a sprayer be used to apply Rust Converter?

Yes. Airless sprayers tend to work the best, with less nozzle clogging. Rust Converter should not be diluted.
Are the vapors from Rust Converter harmful?

No. It is similar to latex paint. The majority of people are not bothered by the vapors, but as with most products of this nature, it is recommended to use it in a well ventilated area.
Is Rust Converter harmful if swallowed?

Yes. Rust Converter contains tannic acid. If swallowed, obtain medical attention.
How long does it take for Rust Converter to dry?

It will take approximately 20 - 60 minutes for it to dry to a smooth, dark finish. To ensure complete transformation of rusty surfaces, apply a second coat. Allow 48 hours of cure time before the application of the finished paint coat (humid conditions may vary drying time). For long lasting protection, the cured rust converter coating should be sealed with two coats of high quality oil-based paint. No other primer is required.
Why is a high quality oil-based paint recommended for a top sealant?

An oil-based paint is considered to be resistant to weather and rain.
How many coats of Rust Converter should be applied on the rusty surface?

To ensure complete transformation of rusty surfaces, always apply a second coat.
Do you have to paint over Rust Converter?

No. Although you do not have to paint after the Rust Converter application, it is recommended to apply a high quality oil-based paint if the item will be stored outdoors. Surfaces protected with Rust Converter and an oil based paint system resist weather, sunlight, rain and even salt spray without peeling or cracking.
Do I need to apply a primer over Rust Converter before I paint?

No. Rust Converter is an excellent primer for use under all oil-based paints.

Q: Can a primer be applied over Rust Converter?
A: Yes, but it is not necessary. Primer must be oil based.
What do you clean the application equipment with?

The application equipment should be cleaned immediately with soap and hot water.
How should Rust Converter be disposed?

You should not return the used Rust Converter to the original container. There may be a chance of contamination to the remaining Rust Converter in the container. Please dispose in accordance with all federal, state and local regulations.