Do I Need to Use a Primer with High-Temperature Paint?

When painting metal surfaces exposed to extreme heat, high-temperature paint (also known as heat-resistant paint, stove paint, BBQ paint, fireplace paint, exhaust paint, header paint, and industrial heat paint) is essential. These specialized coatings protect metal from heat damage, corrosion, and rust while improving appearance.

A common question that arises is: "Do I need to use a primer with high-temperature paint?" The answer primarily depends on exposure conditions. In many cases, using a high-temperature primer can enhance durability and corrosion resistance, ensuring a long-lasting finish.

Is a Primer Necessary for High-Temperature Paint?

Many heat-resistant paints are designed to adhere directly to metal without a primer. However, in certain cases, using a high-temperature primer provides significant benefits, such as:

• Rust Prevention: Adds a layer of protection against corrosion
• Hide: Provides full coverage and concealment of underlying surface imperfections.

When Should You Use a High-Temperature Primer?

• When painting bare metal surfaces, particularly those prone to rust, like steel or iron.
• If the surface is frequently exposed to moisture or extreme temperature fluctuations.
• When manufacturers recommend a primer for optimal performance.

When a high-temperature primer is needed, KBS Coatings offers XTC High-Temperature Primer. For a durable topcoat, XTC is also available.

Using KBS Coatings XTC and XTC Primer

For those looking for a durable and effective high-temperature paint system, XTC and XTC Primer provide excellent results.

XTC Primer

XTC High Temperature Primer is specially formulated for extreme heat exposure while providing exceptional rust prevention.

Key Features and Benefits:

• Extreme Heat Resistance – Designed to withstand high temperatures of up to 1200°F, ensuring that the primer remains stable even under intense heat conditions.
• Excellent Durability - Outstanding adhesion, film integrity, weathering, and thermal shock-resistance throughout this entire temperature range.
• Superior Rust and Corrosion Protection– Acts as a barrier against oxidation and moisture, making it ideal for bare metal surfaces that are prone to rust.
• Exceptionally Tough and Made to Last – Once heat-cured, it creates a tough, chip-resistant finish that won’t crack, peel, or flake.
• Compatible with Multiple Surfaces – Can be applied to steel, cast iron, and other metals, making it versatile for various high-temperature applications.
• Hides Surface Imperfections: Provides full coverage and concealment of underlying surface imperfections.
• Can Provide Final Finish - XTC Primer can be left as a finish coat and does not have to be coated over.

XTC

XTC is a high-performance, heat-resistant paint that offers unmatched durability for metal surfaces exposed to extreme temperatures. This UV-stable coating provides both functional protection and an attractive finish, making it the perfect choice for applications requiring long-term heat resistance.

Key Features and Benefits:

• Withstands Extreme Temperatures – Engineered to handle up to 1500°F (816°C), ensuring metal components remain protected even in the most demanding environments. XTC is guaranteed not burn off.
• Excellent Durability - Outstanding adhesion, film integrity, weathering, and thermal shock-resistance throughout this entire temperature range.
• Corrosion and Oxidation – Blocks moisture and contaminants from penetrating metal surfaces, reducing rust formation. Maximum rust protection is obtained by first priming with XTC Primer.
• Exceptionally Tough and Long-Lasting – Once heat cured, it forms a tough, chip-resistant finish that resists cracking, peeling, and flaking.
• Available in Multiple Colors – Unlike many heat-resistant coatings, XTC comes in over 11 colors, allowing for customization on automotive, industrial, and household applications.

Why Choose KBS Coatings XTC Paint System?

1. All-in-One Solution – The XTC Primer + XTC Paint system ensures optimal performance, reducing the risk of rust, peeling, bubbling, and premature failure.
2. Easy Application – Can be applied using a brush, roller, or spray gun, making it convenient for both professionals and DIYers.
3. Cost-Effective – Protects metal surfaces from deterioration, reducing the need for costly replacements and repairs.
4. Tested for Reliability – Engineered to withstand thermal cycling (heat-up and cool-down cycles) without degrading.

By using XTC High Temperature Primer along with XTC - Xtreme Temperature Coating, you’ll achieve maximum adhesion, excellent corrosion prevention, long-lasting protection, and a professional-grade heat-resistant finish. Whether you're restoring automotive components, upgrading a fireplace, or refinishing industrial machinery, this system is the ultimate solution for extreme heat protection.

Step-by-Step Guide to Applying High-Temperature Paint

Here’s how to apply XTC Primer and XTC Coating properly.

Recommendations When Using

Safety

When applying XTC Primer and XTC coating always work in a well-ventilated area and wear appropriate respiratory and eye protection when handling.

Temperature and Humidity

Ideal application conditions for XTC Primer and XTC coating are between 60-80°F with humidity below 85%. Avoid painting in direct sunlight or excessively humid conditions.

Mixing of XTC Primer and of XTC

Before applying XTC Primer and XTC be sure they are mixed thoroughly. If stirring, use a paint paddle to mix from top to bottom until thoroughly mixed. Take time to mix thoroughly, at least a minute. If aerosol is used shake the can for at least one minute once the mixing ball moves freely. After every one minute of use, shake the can for 10 seconds. The key is to keep the components thoroughly mixed together.

1. Surface Preparation

Before applying high-temperature paint, it’s crucial to prepare the surface properly. Failing to do so can lead to poor adhesion, flaking, and premature wear.

1. Remove Loose, Flakey Rust: Prepare the metal for painting by first removing any loose or flaky rust and old paint. Thereby providing a stable surface to receive XTC. This can be done with 320 grit sandpaper, a wire brush, or by sandblasting.
2. Surface Profile: To properly prepare the metal for painting it needs to be roughened for the strongest adhesion of paints and coatings. This roughness profile, often referred to as an "anchor pattern," allows coatings to latch onto the texture peaks and valleys. This can be done by sandblasting or with a wire wheel, wire brush, or 60-80 grit sand paper.
3. Clean the Surface: The next step is to clean the surface. This step is vital because even a thin layer of dirt, grease, or oil can prevent high-temperature paint from bonding properly to the metal. This can be done with cleaning products like KBS Klean, which will be effective in thoroughly removing contaminants without leaving residue that could interfere with paint adhesion.

KBS Klean is a biodegradable and non-toxic cleaner that removes dirt, grease, and grime effectively from metal surfaces. It works by breaking down oils and other contaminants, allowing paint to adhere strongly. To use KBS Klean, simply mix with warm water, and scrub the metal surface with a sponge, scrub pad or scrub brush. Afterward, rinse the surface thoroughly with water to remove any leftover cleaner, and dry thoroughly with a clean and lint free cloth or compressed air.

Detailed instructions for the use of KBS Klean can be found at kbs-coatings.com/kbs-klean-directions.

2. Priming (Using XTC Primer)

For rust prevention or concealing surface imperfections, apply XTC Primer. This primer can serve as a durable finish coat on its own, but topcoating with XTC provides added protection and a wide range of color options.

• Apply thin, even coats (approx. 1.0 mils/25um dry film thickness) using a brush, roller, aerosol version or spray gun. If topcoating with XTC, one coat of primer and one coat of XTC are typically recommended. If not, apply two thin coats of XTC Primer.
• Note, when using XTC Primer alone, two coats typically ensure durability, but the required number depends on service conditions.
• When spraying with the aerosol version, hold the aerosol can 12-15 inches from surface and apply using steady, even and overlapping strokes.
• Allow a dry time between coats of 15-30 minutes if sprayed and 8 hours if brushed or rolled. Note that heavy applications can lead to reduced coating life and adhesion. As with all KBS Products, multiple thin covering coats is always the best practice.
• Allow the primer to dry completely before handling or applying a topcoat of XTC (typically 1-2 hours, depending on conditions).
• Temperature Curing – XTC Primer must be temperature cured. Please see the Temperature Curing the Paint section below.

3. Applying XTC – Xtreme Temperature Coating

• Apply thin, even coats (approx. 1.0 mils/25um dry film thickness) using a brush, roller, aerosol version, or spray gun. For XTC Primer application, one coat of primer followed by one coat of XTC is typically recommended. If you do not use XTC Primer, apply two thin coats of XTC.
• If you are not using XTC Primer, apply a minimum of two coats (1.0 mils/25um dry film thickness each) of XTC. Allow a drying time between the coats of 15-30 minutes if sprayed and 8 hours if brushed or rolled.
• Typically, two to three coats provide optimal durability. However, the number of XTC coats required depends on the service conditions of the painted item.
• When using the aerosol version, hold the can 12-15 inches from the surface and apply with steady, even, and overlapping strokes.
• Allow XTC to completely dry before handling (typically 1-2 hours, depending on conditions).
• Temperature Curing – XTC requires temperature curing. Please refer to the Temperature Curing the Paint section below for details.

For detailed instructions on using XTC Primer and XTC, visit kbs-coatings.com/xtc-directions.

4. Temperature Curing the Paint

Why is Temperature Curing Important?

Temperature curing hardens the primer and coating resins, maximizing heat resistance and durability. Both XTC Primer and XTC require a simple curing before use. However, when used together, curing is only necessary after applying the XTC, as it simultaneously cures both the primer and coating.

How to Temperature Cure Properly:

1. Heat coated metal to approximately 350°F for 20-30 minutes. This can be done using an oven or BBQ grill.
2. Heat metal until the XTC begins to smoke and remove from heat source.
3. Allow to naturally cool to room temperature.
4. Repeat this process three times (total of three heat/cool cycles).
5. Perform a fourth heat cycle until the XTC smokes again and keep heated until the smoke fully dissipates.
6. Remove from heat source and allow to naturally cool to room temperature.
7. This gradual curing process ensures proper adhesion and durability.
8. If touch-ups are needed, follow the same preparation and application process.
9. Note: For exhaust headers and manifolds, this procedure can be performed directly on the engine instead of using an oven or BBQ. For full application instructions, visit kbs-coatings.com/xtc-directions.

Important Notes: Ventilation is crucial during initial heat curing, as the coating may emit potentially harmful vapors. Also, avoid excessive heat during the first few heat/cool cycles to allow the resins to temper into the substrate properly.

Final Thoughts: Is a Primer Necessary for High-Temperature Paint?

While some high-temperature paints can adhere directly to metal, using a high-temperature primer can provide additional protection and extend the life of the coating.

KBS Coatings XTC Primer and XTC offer a complete solution for painting heat-exposed metal surfaces, ensuring durability, rust resistance and a long-lasting finish.

By following proper surface preparation, application, and temperature curing techniques, you can achieve a professional, heat-resistant finish on everything from BBQ grills to automotive exhaust systems.

Whether you’re working on an engine, fireplace, industrial equipment, or metal stove, choosing the right primer and high-temperature paint system will make all the difference.

Questions?

If you have any questions, please let us know. +Contact KBS Coatings.