Rust is a chemical process that corrodes metal, which can lead to structural damage over time. Therefore, it is essential to choose high-quality paint and primer products that can prevent rust from forming again.
For rusty metal, it is best to use an oil-based enamel paint. Oil-based paints are thicker than water-based paints, providing better coverage and protection for rusty metal surfaces. An oil-based, rust-inhibiting primer should also be used as a base coat for extra protection.
In this article, you will learn:
- The 4 factors to consider when choosing paint for rusty metal
- What type of paint to use
- What finish is best
- My top picks for the best paint and primer for rusty metal
The 4 Factors to Consider When Choosing Paint for Rusty Metal
1. Type and Severity of Rust
Before you choose the paint for your rusty metal surface, you need to assess the type and severity of rust. Surface rust is light and can be removed by sanding or brushing.
Deep rust, on the other hand, may require more intensive prep work, such as sandblasting. The type and severity of rust will determine the type of paint you need to use and the prep work required.
2. Location and Exposure to the Elements
The location and exposure to the elements will play a role in determining the type of paint you use. For example, if the rusty metal surface is outdoors, you’ll need paint that can withstand UV rays, moisture, and temperature changes.
Marine-grade paint is ideal for surfaces exposed to saltwater or salty air. If the surface is located indoors, you may be able to use less durable paint.
3. Application Method
Different paints have different application methods, and your chosen method will depend on your skills, experience, and available tools. Some paints can be applied with a brush, while others require a spray gun or roller.
When choosing paint, consider the application method that’s most convenient for you. If you’re a beginner, consider buying easy-to-apply paint with clear instructions.
4. Primer
Primer is a preparatory coating that’s applied to surfaces before painting. It improves paint adhesion, fills in small imperfections, and prevents rust. When choosing paint for rusty metal, consider buying a rust-inhibiting primer formulated specifically for metal surfaces.
What Type of Paint Is Best?
Oil-Based Enamel Paint
Oil-based enamel paint is a type of paint that is made with an oil-based solvent. It forms a hard, glossy finish and provides long-lasting protection for metal surfaces. Oil-based enamel paints are ideal for painting rusty metal due to their durability and resistance to corrosion.
Pros
- Hard, glossy finish
- Durable and resistant to corrosion
- Long-lasting protection for metal surfaces
Cons
- Takes longer to dry than other types of paint
- More difficult to clean up than water-based paints
- Not as environmentally friendly as other types of paint
Acrylic-Latex Paint
Acrylic-latex paint is a water-based paint that contains an acrylic resin binder. It is one of the best-quality latex paints known for its superior adhesion, durability, and flexibility. It is often used to paint rusty metal due to its ability to flex slightly and resist cracking or brittle.
Pros
- Superior adhesion
- Durability
- Flexibility
- Resists cracking or going brittle
Cons
- Can be more expensive than other types of paint
What Paint Finish Is Best?
When painting rusty metal, choosing the right paint finish is essential to ensure the paint adheres well to the surface and provides long-lasting protection against future rusting. While various paint finishes are available, a gloss finish is undoubtedly the best option.
A gloss finish is a highly reflective coating that provides a smooth, shiny surface, making it an excellent choice for metal surfaces.
The glossy surface finish helps prevent moisture from penetrating the metal surface, reducing the likelihood of rust formation.
Moreover, the gloss finish makes it much easier to clean the surface without worrying about damaging the paint or causing further rusting.
Another reason why a gloss finish is also a great choice for painting rusty metal is that it offers superior durability under different environmental conditions.
The glossy finish is resistant to fading, chalking, and cracking, making it a perfect choice for exposure to direct sunlight and harsh weather conditions.
Additionally, the finish can withstand damage from chemicals and other substances, ensuring your metal surface remains protected for a long time.
The Best Paint and Primer for Rusty Metal
Spray paint is a great way to quickly and easily give rusty metal a new look. It can be used to cover up rust and protect the metal from further corrosion.
With the right preparation, spray paint can provide an attractive finish that will last for years. It’s also easy to apply and can be done in a short amount of time.
Best Paint
Krylon Rust Protector Paint and Preventative Enamel is one of the most effective solutions for spray painting rusty metal. With a dry time of just 8 minutes, it’s not only fast-drying but also guards against rust more effectively than any other paint on the market.
One of the best things about Krylon Rust Protector Paint and Preventative Enamel is that it can be used for various metal surfaces in different environments.
It has been tested and proven to provide superior protection against rust in harsh conditions. Moreover, it offers excellent adhesion to rusty surfaces, ensuring a smooth and durable finish that lasts.
It is also designed to prevent rust from forming on metal surfaces. It features a unique formula containing rust inhibitors, which protect the metal from rust formation and oxidation.
As a result, it delivers long-lasting protection against rust and corrosion, making it ideal for metal surfaces exposed to harsh weather conditions.
Best Primer
When painting heavily rusted metal surfaces, Rust-Oleum Stops Rust Rusty Metal Primer is the best primer for the job. Its oil-based formula provides a durable protective coating with excellent rust prevention, making it ideal for interior and exterior use.
This rust primer dries to the touch in just 15-30 minutes and covers between 10-12 sq. ft. (1m²) per can, making it a very cost-effective option. Its excellent adhesion makes it perfect for use in demanding, heavy-use environments.
What sets Rust-Oleum Stops Rust Rusty Metal Primer apart is its ability to drive out corrosive air and moisture that other primers may leave behind.
This, in turn, creates a surface that topcoats can easily adhere to, making the painting process more efficient and ensuring a consistent, long-lasting finish.
One of the standout features of this rust primer is its comfort tip, which includes a wider finger pad to reduce fatigue caused by continuous spraying.
Furthermore, its any-angle spray feature allows you to spray in any direction, including upside down, making accessing all areas of the rusted metal surface easier.