Asphalt Emulsion Sealers: What Contractors Need to Know About Pavement Protection

Protecting asphalt pavement from the elements requires more than just routine maintenance it demands the right sealer applied at the right time. Asphalt Safety Comprehensive Guide to Hazard Management in operations highlights the importance of proper handling throughout the maintenance lifecycle and sealers are no exception. Asphalt emulsion sealers have become the go-to solution for extending pavement life blocking oxidation and resisting water intrusion all while delivering a uniform finished appearance that satisfies both property owners and paving professionals. Understanding what goes into these materials how they perform and how to select the right product for a given application is essential for contractors who want to deliver long-lasting results.

Understanding Asphalt Emulsion Sealers

What Is an Asphalt Emulsion Sealer?

An asphalt emulsion sealer is a water-based material composed of asphalt cement emulsified with water and specialized additives. Unlike cutback sealers that rely on petroleum solvents for liquefaction emulsion sealers use water as the carrying agent making them more environmentally friendly and safer to handle on site. When applied to a prepared asphalt surface the water evaporates leaving behind a protective asphalt film that bonds to the existing pavement.

Companies such as GuardTop a division of Western Emulsions Inc. based in Monarch Beach California specialize in producing these emulsion sealers for the pavement maintenance industry. The company recently opened a new distribution center outside Atlanta under the name GuardTop Express to serve the southeastern United States more efficiently. According to Jeff Luzar division manager the distribution facility complements GuardTop existing Southeast manufacturing operation allowing faster delivery and better support for contractors working in that region.

Key Components of Emulsion Sealers

Asphalt emulsion sealers typically contain the following components each playing a specific role in performance and durability:

• Base asphalt cement The primary binding agent that provides adhesion and waterproofing properties
• Water The carrying medium that keeps the emulsion in liquid form for application
• Emulsifying agents Surfactants that stabilize the suspension of asphalt particles in water
• Polymer modifiers Added to improve flexibility adhesion and resistance to tracking and abrasion
• Mineral fillers Fine aggregates such as silica sand or limestone that add body and improve skid resistance
• Color pigments Often carbon black or iron oxide used to achieve a uniform dark appearance

How Emulsion Sealers Differ from Coal Tar Sealers

The pavement maintenance industry historically relied on coal tar based sealers for their excellent resistance to petroleum spills and UV degradation. However environmental and health concerns have driven a significant shift toward asphalt emulsion products. Coal tar contains polycyclic aromatic hydrocarbons which have been linked to health risks and restricted in several states and municipalities. Asphalt emulsion sealers offer a safer alternative without sacrificing performance when properly formulated with polymer modifiers and high-quality base asphalt cement. For contractors seeking compliant and durable options understanding the differences between these two families of sealers is critical.

Surface Preparation and Application Methods

Pre-Application Surface Evaluation

Before any sealer touches the pavement a thorough surface evaluation is necessary. The condition of the existing asphalt directly affects how well the sealer bonds and how long the coating lasts. Contractors should inspect for the following issues:

1. Cracking Hairline cracks may be sealed during the coating process but larger cracks require crack filling beforehand
2. Oxidation Faded or gray asphalt indicates the binder has degraded and may need more intensive preparation
3. Drainage problems Standing water areas will fail prematurely and must be corrected before sealing
4. Oil and fuel stains These prevent adhesion and must be cleaned or primed with a compatible product
5. Raveling Loose aggregate at the surface signals structural weakness that sealing alone cannot fix

Cleaning and Crack Sealing

Proper cleaning is arguably the most important step in any sealcoating project. Power washing or mechanical sweeping removes dirt debris and loose material that would otherwise prevent the sealer from bonding. After cleaning the surface must be allowed to dry completely before application. Cracks wider than one-quarter inch should be filled with a hot-applied or cold-applied crack filler and allowed to cure according to the manufacturer specifications. Failing to address cracks before sealing leads to reflective cracking through the new coating within weeks or months.

Application Equipment and Techniques

Sealer can be applied using several methods depending on project size accessibility and finish requirements:

• Spray application Most efficient for large areas. Uses a spray system with a fan tip to apply a uniform coat. Requires experienced operators to avoid overlap marks and uneven coverage.
• Squeegee application Common for smaller lots and residential driveways. Provides excellent control over film thickness but is slower and more labor intensive.
• Brush application Used for edges tight corners and areas where spray or squeegee cannot reach. Often done as a detail step before the main application.

Manufacturers such as GuardTop provide detailed application guidelines for their specific emulsion products. Following these recommendations is essential because formulation differences affect optimal application temperature dilution ratios and cure times. GuardTop Express the company new distribution center in Doraville Georgia located at 2400 Weaver Way Suite J serves as a local resource for contractors seeking product-specific guidance and timely material supply.

Performance Factors and Quality Control

Climate and Weather Considerations

The performance of an asphalt emulsion sealer is heavily influenced by weather conditions during and after application. The ideal application window includes ambient temperatures above 10 degrees Celsius and no rain forecast for at least 24 hours. High humidity slows evaporation of the water carrier extending cure time and leaving the fresh coating vulnerable to washout. Conversely hot direct sunlight can cause the sealer to skin over before the water fully evaporates leading to blistering and poor film formation. Understanding how local climate conditions affect cure behavior is essential for timing sealcoating projects correctly.

Dilution and Mixing Ratios

Asphalt emulsion sealers are typically supplied in concentrated form and must be diluted with water on site before application. The correct dilution ratio varies by product and manufacturer specification. Over-diluting saves material cost in the short term but produces a thin film that wears quickly. Under-diluting makes the material too thick to spread evenly and can cause waste. Following a structured mixing procedure ensures consistent quality across every batch:

1. Fill the mix tank with the required amount of water first
2. Add any specified additives such as polymer modifiers or sand
3. Introduce the concentrated emulsion while the mixer is running
4. Mix thoroughly for the recommended time typically 3 to 5 minutes
5. Check viscosity using a field flow cup if available
6. Adjust with small increments of water or concentrate as needed

Film Thickness and Coverage Rates

Coverage rates directly affect the durability of the finished sealer coat. Industry standards typically call for two coats with a combined application rate that achieves a minimum dry film thickness of 0.25 to 0.38 millimeters. Applying sealer too thinly leaves the underlying pavement exposed to oxidation and traffic wear. Applying too thickly can lead to cracking and peeling as the film cures. Contractors should calculate coverage based on the product solid content and the condition of the existing pavement rather than relying on a one-size-fits-all rate. Asphalt Plants and Pavement Construction Equipment a Complete resource on production quality can help contractors understand how pavement condition at the time of placement affects long-term performance including the need for sealing.

Selecting the Right Sealer for the Job

Traffic Levels and Surface Use

Not all sealers perform equally under different traffic conditions. Light-duty sealers suitable for residential driveways and pedestrian areas may fail quickly on commercial parking lots with heavy vehicle traffic. When selecting a sealer contractors should evaluate the following factors:

• Daily vehicle count and weight class of expected traffic
• Turning and braking zones where shear stress is highest
• Exposure to petroleum drips in parking or fueling areas
• Presence of pedestrian traffic requiring slip-resistant finish
• Expected maintenance interval before resealing is needed

Polymer-modified emulsion sealers generally offer superior durability for commercial and high-traffic applications. The polymer network within the cured film provides elasticity that resists cracking from thermal cycling and flexibility that accommodates minor pavement movement. Asphalt Bitumen Tar distinctions are useful background knowledge for contractors selecting between emulsion types as each base material offers different performance characteristics.

Slip Resistance and Safety Requirements

Safety is a growing concern in sealcoating specifications particularly for projects involving pedestrian areas slopes and wheelchair accessible routes. Unmodified emulsion sealers can become slippery when wet. Adding fine silica sand or specifying a textured finish helps maintain slip resistance while preserving the protective qualities of the coating. Some jurisdictions now require documented slip resistance testing as part of project acceptance for commercial and municipal work. Contractors should verify local code requirements before selecting a product or finish texture.

Environmental Regulations and Compliance

Environmental regulations increasingly influence product selection in the pavement maintenance industry. Asphalt emulsion sealers benefit from lower volatile organic compound content compared to solvent-based alternatives making them compliant with air quality regulations in many metropolitan areas. However specific formulations may still face restrictions depending on local rules. Contractors operating across multiple jurisdictions should verify product compliance in each market. Asphalt Pavements Types provides a helpful overview of how pavement classification affects maintenance strategies and material selection.

Storage and Handling Best Practices

Proper storage of asphalt emulsion sealers prevents material degradation and ensures consistent performance across jobs. Emulsions are sensitive to freezing which causes the asphalt particles to break out of suspension resulting in an unusable material. Storage recommendations include:

• Store at temperatures above 4 degrees Celsius and below 38 degrees Celsius
• Keep containers sealed to prevent water evaporation and skin formation
• Rotate stock using a first-in first-out inventory system
• Agitate stored material periodically to maintain uniform consistency
• Never store emulsion sealers in containers that previously held incompatible chemicals

The expansion of distribution networks such as GuardTop Express in Doraville Georgia reflects the industry effort to shorten the supply chain and deliver fresher material to contractors. With a dedicated distribution hub closer to job sites contractors reduce the time product spends in storage and transit improving the likelihood of receiving material at optimal condition for application. This regional distribution model represents a practical advantage for pavement maintenance professionals working in the Southeast.

Conclusion

Asphalt emulsion sealers remain one of the most effective tools available for extending pavement life and improving the appearance of asphalt surfaces. From understanding the basic chemistry of emulsion formulations to mastering application techniques and navigating environmental regulations contractors who invest in sealer knowledge deliver better results for their clients. The growing network of regional distribution centers including GuardTop Express in Doraville makes quality sealer products more accessible than ever. By selecting the right product preparing the surface properly and applying with attention to film thickness and cure conditions pavement maintenance professionals can achieve durable attractive results that stand up to traffic weather and time.