Self Leveling Sealant: Best Types, Uses & How to Choose (2026 Guide)

When it comes to sealing horizontal joints efficiently, self leveling sealant has become the industry’s go-to solution. Unlike traditional sealants that require manual tooling, this type of sealant flows automatically, creating a smooth, even surface with minimal labor.

From concrete expansion joints to highways and airport runways, self leveling sealants play a critical role in modern construction.

But not all sealants are the same.

Choosing the right material—polyurethane, silicone, or MS polymer—can directly impact durability, flexibility, and long-term performance.

What Is Self Leveling Sealant?

A self leveling sealant is a low-viscosity, flowable sealant designed for horizontal applications. After application, it spreads evenly and settles into joints, forming a smooth, flat surface without tooling.

Once cured, it becomes a flexible, rubber-like elastomer that can:

• Absorb structural movement

• Prevent water penetration

• Resist weather and aging

• Maintain long-term elasticity

This makes it ideal for large-scale construction where efficiency and consistency are critical.

Where Is Self Leveling Sealant Used?

Self leveling sealants are widely used in horizontal joint sealing, especially in high-load or outdoor environments.

Concrete Expansion & Control Joints

Used in:

• Concrete slabs

• Industrial floors

• Warehouses

They prevent cracking and water infiltration while allowing movement.

Roads, Driveways & Sidewalks

Perfect for:

• Crack repair

• Joint filling

• Surface leveling

They improve durability and extend pavement life.

Airports, Bridges & Highways

In heavy-duty applications such as:

• Airport runways

• Bridge expansion joints

• High-traffic roads

Sealants must withstand extreme movement, temperature changes, and chemicals.

Decks & Parking Structures

Used in:

• Parking garages

• Plaza decks

• Podium structures

They provide long-term waterproofing and flexibility.

What Is Self Leveling Sealant Made Of?

There are three main types of self leveling sealants used in the market today:

1. Polyurethane (PU) Self Leveling Sealant

This is the most commonly used type in construction.

Key advantages:

• Excellent adhesion to concrete

• High elasticity (elongation can exceed 600%)

• Strong durability and wear resistance

Recommended Product:
Kingwit TP630 Self Leveling Polyurethane Sealant

• One-component, ready to use

• Low modulus for joint movement

• Excellent performance in concrete roads and bridges

• Service temperature from -40°C to +90°C

This makes it a reliable choice for infrastructure and heavy-duty sealing projects.

2. Silicone Self Leveling Sealant

Silicone sealants are known for their extreme weather resistance and flexibility.

Key advantages:

• Outstanding UV resistance

• Performs in extreme temperatures

• Long service life

Recommended Product:

Kingwit TNS-780 Self Leveling Silicone Sealant

• Neutral curing, one-component system

• Excellent adhesion to asphalt and concrete (even aged surfaces)

• High elasticity (elongation up to ~488%)

• مقا resistant to jet fuel and road salts

This makes it ideal for airport runways, highways, and harsh outdoor environments.

3. MS Polymer (Hybrid) Self Leveling Sealant

MS polymer combines the strengths of silicone and polyurethane.

Key advantages:

• Eco-friendly and low odor

• Paintable surface

• Strong adhesion without primer

• Balanced flexibility and durability

Recommended Product:
Kingwit TM515 Self Leveling MS Polymer Sealant

• Moisture curing, forms durable elastomer

• Self-leveling with smooth, glossy finish

• Low shrinkage, no denting after curing

• Excellent UV and weather resistance

This makes it a versatile solution for both indoor and outdoor construction joints.

How to Choose the Right Self Leveling Sealant

Choosing the right product depends on your application:

• For heavy load & structural joints → PU (TP630)

• For extreme weather & chemical exposure → Silicone (TNS-780)

• For eco-friendly & general construction use → MS Polymer (TM515)

A correct match can significantly improve service life, sealing performance, and maintenance cost.

Why Choose Kingwit Self Leveling Sealants?

Kingwit offers a complete self leveling sealant system, covering all major application needs:

• Full range: PU + Silicone + MS Polymer

• Proven performance in roads, bridges, airports, and buildings

• Stable quality and consistent formulation

• Flexible packaging options (cartridge, sausage, pail)

• Suitable for global climate conditions

Whether you are a contractor, distributor, or project owner, Kingwit provides reliable sealing solutions for demanding environments.

Conclusion

Self leveling sealant is an essential material for modern construction, especially for horizontal joint sealing and waterproofing.

By understanding the differences between polyurethane, silicone, and MS polymer, you can select the right solution for your project—and ensure long-term performance.

If you are looking for a complete and professional self leveling sealant solution, Kingwit’s product range offers proven performance across all major applications.

FAQ 

1. What is the difference between self leveling and non-sag sealant?

Self leveling sealant flows and is used for horizontal joints, while non-sag sealant stays in place for vertical applications.

2. Is polyurethane or silicone better for self leveling sealant?

Polyurethane is better for structural strength and heavy load areas, while silicone performs better in extreme weather and chemical environments.

3. Can self leveling sealant be painted?

PU and MS polymer sealants are usually paintable, while silicone sealants are generally not.

4. How long does self leveling sealant last?

High-quality sealants can last 10–20 years, depending on material type and environmental conditions.