Difference Between HS, HHS and UHS Clearcoat

In the automotive refinishing industry, clearcoat selection plays a major role in determining final appearance, durability, repair efficiency, and overall paint performance.

When choosing a clearcoat system, body shops and distributors often encounter terms such as:

• HS Clearcoat
• HHS Clearcoat
• UHS Clearcoat

But what do these terms actually mean?

More importantly:

• Which one provides better gloss?
• Which one dries faster?
• Which one offers better durability?
• Which one is more suitable for modern body shop operations?

In this article, we explain the key differences between HS, HHS, and UHS clearcoats and how each system is used in automotive refinishing.

What Does HS, HHS and UHS Mean?

These terms mainly refer to the solid content level inside the clearcoat.

“Solid content” means the amount of actual coating material that remains on the vehicle surface after solvents evaporate.

Generally:

• Higher solid content = thicker paint film
• Lower solvent content = lower VOC emissions
• Better fullness and gloss performance

1. HS Clearcoat (High Solid)

HS clearcoat is one of the most common automotive refinishing clearcoat systems.

It provides a good balance between:

• application ease
• gloss
• drying speed
• cost efficiency

Typical Characteristics:

• Medium-to-high solid content
• Smooth application
• Good leveling performance
• Suitable for general repair work
• Widely used in body shops worldwide

Advantages:

• Easy spraying process
• Stable performance
• Cost-effective
• Good appearance quality

Limitations:

• Lower film build compared with HHS or UHS
• Slightly lower gloss depth
• May require additional coats for premium finish results

HS systems remain very popular for standard collision repair and daily refinishing operations.

2. HHS Clearcoat (Higher High Solid)

HHS clearcoat is an upgraded version of traditional HS systems.

It contains higher solid content and provides improved:

• gloss
• fullness
• film thickness
• durability

HHS clearcoats are becoming increasingly popular in modern professional body shops.

Typical Characteristics:

• Higher solid concentration
• Lower solvent ratio
• Better build per coat
• Stronger visual depth
• Improved anti-shrink performance

Advantages:

• Excellent gloss and clarity
• Better fullness effect
• Reduced risk of shrinkage
• Strong durability
• Better leveling performance
• Higher transfer efficiency

Limitations:

• Slightly higher viscosity
• Requires proper spray technique
• Material cost may be higher than standard HS

HHS clearcoat is often preferred for:

• premium refinishing work
• high-end vehicles
• EV repairs
• professional body shop operations

It offers a strong balance between appearance quality and operational efficiency.

3. UHS Clearcoat (Ultra High Solid)

UHS clearcoat represents one of the highest solid-content technologies in automotive refinishing.

It is designed for:

• maximum film build
• ultra-low VOC compliance
• premium finish quality
• high productivity

Typical Characteristics:

• Extremely high solid content
• Very low solvent level
• Thick coating build
• High gloss depth
• Excellent environmental compliance

Advantages:

• Outstanding gloss and DOI (Distinctness of Image)
• Very high film thickness
• Excellent durability
• Reduced VOC emissions
• Fewer coats required
• High production efficiency

Limitations:

• More demanding application process
• Sensitive to spray technique
• Higher material viscosity
• Requires experienced technicians
• More difficult blending in some repairs

UHS systems are commonly used in:

• premium repair centers
• OEM-level refinishing
• environmentally regulated markets
• luxury vehicle repairs

Main Differences Between HS, HHS and UHS Clearcoat

Why Higher Solid Clearcoats Are Becoming More Popular

Modern automotive refinishing trends are moving toward:

• lower VOC emissions
• higher efficiency
• premium appearance quality
• faster repair turnaround

As EV and luxury vehicle markets continue growing, body shops increasingly require:

• deeper gloss
• stronger durability
• reduced shrinkage
• faster productivity
• environmentally compliant systems

This is one reason why HHS and UHS clearcoats are becoming more widely adopted globally.

Which Clearcoat Is Best for Your Body Shop?

The best clearcoat depends on:

• repair volume
• technician experience
• local VOC regulations
• target vehicle market
• desired finish quality

HS Clearcoat:

Best for:

• general repair work
• standard body shops
• cost-focused operations

HHS Clearcoat:

Best for:

• professional collision centers
• premium refinishing
• EV repair shops
• shops seeking higher gloss and efficiency

UHS Clearcoat:

Best for:

• luxury vehicle repairs
• advanced professional technicians
• high-end refinishing environments
• low-VOC regulated markets

The Future of Clearcoat Technology

Automotive refinishing technology continues evolving rapidly.

Modern clearcoat development now focuses on:

• lower VOC emissions
• improved gloss retention
• faster curing
• anti-scratch performance
• anti-yellowing technology
• better compatibility with advanced EV colors

As customer expectations rise, body shops increasingly rely on higher-performance clearcoat systems to remain competitive.

Final Thoughts

Understanding the differences between HS, HHS, and UHS clearcoats is essential for choosing the right refinishing system.

Each technology offers unique advantages depending on:

• repair requirements
• production speed
• finish expectations
• environmental standards

For modern body shops, selecting the correct clearcoat system can directly improve:

• repair quality
• operational efficiency
• customer satisfaction
• long-term profitability