Hardtop AX

Jotun Hardtop AX Overview

Jotun Hardtop AX is a two-component, premium high-gloss polyurethane topcoat renowned for its exceptional gloss and colour retention. Formulated for durability, it offers excellent chemical resistance, making it suitable for aggressive atmospheric environments. Its high-volume solids (63%) contribute to lower volatile organic compounds (VOCs) resulting in a lower environmental impact than alternative products.

Key Product Features

• Two-Component Polyurethane - Ensures a durable and resilient finish.
• High Gloss Finish - Provides an aesthetically pleasing appearance with consistent gloss retention.
• Excellent Chemical Resistance - Suitable for use in aggressive atmospheric environments.
• High Sag Resistance - Allows for application of thicker coats without sagging.
• Low Odour - Improves working conditions during application.
• Low VOC Content - High-volume solids result in reduced environmental impact. 

Suitable Uses and Applications

Jotun Hardtop AX can be used on a number of different substrates including;

• Properly prepared steel
• Aluminium
• Concrete surfaces
• Previously painted surfaces

It can also be used for a wide variety of applications

• Marine Environments - Ideal for topsides, decks, and superstructures requiring a durable, glossy finish.
• Industrial Structures - Suitable for offshore structures, refineries, and power plants exposed to harsh conditions.
• Commercial Buildings - Applicable to facades and architectural elements needing long-lasting aesthetic appeal.

Basic Application Guide

For more information on applying Jotun Hardtop AX please see our detailed application guide here

Step 1 - Surface Preparation

• When applying Hardtop AX, it is important to verify any existing coatings to ensure compatibility.  If unsure, removal of existing coatings is advisable.
• Ensure surfaces are clean, dry, and free from contaminants.
• For steel, aluminium or concrete, an appropriate primer such as Jotamastic or Penguard should be applied.

Step 2 - Mixing

• Mix Hardtop AX Component A with Component B in a 4:1 volume ratio.
• Stir thoroughly to achieve a homogeneous mixture.

Step 3 - Thinning

• For best results we recommend thinning.  The percentage thinning is dependent on the application method and ambient conditions.  We recommend starting at 10% and adjusting accordingly
• Use Jotun Thinner No. 10, adhering to local VOC regulations.

Step 4 - Application Conditions and Methods

• Temperature - Apply when ambient and surface temperatures are between 10°C and 30°C.
• Humidity - Ensure relative humidity is below 85% to promote proper curing.
• Brush, Roller or Spray.  Best results will be achieved using conventional airspray.

Step 5 - Drying and Curing

• Touch Dry - Approximately 1 hour at 23°C.
• Dry to Overcoat - Minimum 5 hours at 23°C.
• Full Cure - Approximately 5 days at 23°C.

Step 6 - Cleanup

• Clean tools and equipment immediately after use with Jotun Thinner No. 10. 

Jotun Hardtop AX Frequently Asked Questions (FAQ’s)

The FAQ's below are for general guidance only.  For specific questions, please refer to the application guides and data sheets on our product pages or give us call and we will answer any questions that you have.

Q. What substrates can Jotun Hardtop AX be applied to?
A. Jotun Hardtop AX is suitable for properly prepared steel, aluminium, and concrete surfaces, as well as previously painted surfaces. It provides excellent adhesion when applied over a compatible primer, ensuring long-lasting protection and durability.

Q. Is a primer necessary before applying Jotun Hardtop AX?
A. Yes, applying a suitable primer is recommended to enhance adhesion and corrosion resistance. For steel, Jotamastic or Penguard primers are commonly used, while for aluminium and concrete, Penguard is the preferred choice.

Q. How long does Jotun Hardtop AX take to dry?
A. At 23°C, Hardtop AX is touch dry in approximately 1 hour. It can be overcoated after a minimum of 5 hours and reaches full cure in about 5 days. Drying times may vary depending on temperature and humidity levels.

Q. Can Jotun Hardtop AX be applied over existing paint?
A. Yes, it can be applied over existing, well-adhered 2-pack coatings after proper surface preparation. The surface should be clean, dry, and lightly abraded to ensure good intercoat adhesion before applying Hardtop AX.

Q. What application methods are suitable for Jotun Hardtop AX?
A. Hardtop AX can be applied using airless spray, conventional spray, brush, or roller. Conventional airsprayspray is the best method for achieving the smoothest finish. Application by  airless spray  gives optimal dry film thickness in a single coat.

Q. How should the surface be prepared before application?
A. All surfaces must be clean, dry, and free from grease, oil, and contaminants.. All surfaces require suitable primers before applying Hardtop AX unless you’re applying over an existing compatible topcoat.

Q. Is thinning required for Jotun Hardtop AX?

A.  For best results we recommend thinning.  The percentage thinning is dependent on the application method and ambient conditions.  We recommend starting at 10% and adjusting accordingly.  Jotun Thinner No. 10 can be used. 

Q. What is the coverage rate of Jotun Hardtop AX?
A. The typical spreading rate when using a brush or roller and 10% thinners is around 12 – 15m² per litre.  Actual coverage will vary depending on surface roughness, porosity, and application method.

Q. Can Jotun Hardtop AX be used in marine environments?
A. Yes, it is widely used in marine applications, including ship exteriors, superstructures, and offshore platforms. It offers excellent UV and weather resistance, making it suitable for harsh marine conditions.

Q. How should tools and equipment be cleaned after use?
A. Tools and equipment should be cleaned immediately after application using Jotun Thinner No. 10.

Q. How durable is Jotun Hardtop AX in industrial environments?
A. Jotun Hardtop AX is highly durable and provides excellent resistance to abrasion, chemicals, and harsh atmospheric conditions, making it ideal for industrial sites, refineries, and offshore structures.

Q. Is Jotun Hardtop AX resistant to UV exposure?
A. Yes, Hardtop AX provides superior UV resistance, ensuring long-term gloss and colour retention, which makes it ideal for exterior applications in harsh environments.

Q. Can Jotun Hardtop AX be used in high-temperature environments?
A. While Hardtop AX is suitable for atmospheric exposure, it is not recommended for surfaces exposed to continuous high temperatures above 120°C. For high-heat applications, a heat-resistant coating is recommended.

Q. Is Jotun Hardtop AX compliant with environmental regulations?
A. Yes, Hardtop AX has a low VOC formulation compared to traditional polyurethane coatings, making it more environmentally friendly while still offering exceptional durability and performance.