The Ultimate Guide to
Sealcoating:
Types, Brands, and Everything You Need to Know
Introduction
Sealcoating is one of the most cost-effective maintenance strategies available for asphalt pavement. Whether you're a property manager overseeing a commercial parking lot, a contractor bidding on paving jobs, or a homeowner trying to squeeze more life out of your driveway, choosing the right sealcoat can mean the difference between a surface that lasts 20+ years and one that crumbles within a decade. Yet for all its importance, sealcoat selection is frequently treated as an afterthought — a commodity buy where the lowest price wins.
This guide changes that. We'll go deep into the chemistry, application mechanics, real-world performance, and brand-by-brand comparison of every major sealcoat category on the market. By the end, you'll understand not just what to buy, but why one product outperforms another in your specific climate, traffic conditions, and substrate type.
Part 1: Why Asphalt Needs Sealcoating in the First Place
Before comparing products, it helps to understand what you're actually protecting against. Fresh asphalt is a flexible, relatively resilient material made of aggregate (sand, gravel, and crushed stone) bound together by bitumen — a petroleum-derived binder. The problem is that bitumen is inherently vulnerable to:
- ▹ UV Oxidation — Sunlight degrades the molecular chains in bitumen, causing it to harden, become brittle, and eventually crack. This is the single largest cause of premature asphalt failure in sunbelt states like Texas, Arizona, and Florida.
- ▹ Water Infiltration — Once surface cracking begins, water finds its way into the subsurface layers. Freeze-thaw cycles in northern climates turn this water into ice that pries the structure apart from the inside. Even in warmer climates, standing water softens the subbase and accelerates rutting.
- ▹ Fuel and Chemical Spills — Gasoline, diesel, motor oil, and hydraulic fluid are petroleum-based solvents that dissolve bitumen on contact. High-traffic areas like gas stations, bus depots, and industrial facilities are especially vulnerable.
- ▹ Oxidation Fading — Beyond structural degradation, oxidized asphalt turns gray, loses its fresh black appearance, and signals neglect to customers, tenants, and visitors.
Sealcoating addresses all four threats simultaneously by applying a protective layer over the existing asphalt. Done on a proper maintenance schedule (typically every 2–4 years), it can double or triple the life of a pavement investment.
Part 2: The Four Main Types of Sealcoat
1Coal Tar Emulsion
What it is: Coal tar is a thick, dark liquid produced as a byproduct of coke production in the steel industry. When emulsified with water, clay fillers, and sand, it creates one of the most durable and chemically resistant sealcoats available.
How it works: Coal tar forms an extremely hard, dense film over asphalt that is virtually impervious to petroleum solvents. Its polycyclic aromatic hydrocarbon (PAH) structure makes it resistant to fuel spills in a way that no other sealcoat type can fully replicate.
Strengths
- ✓ Best-in-class resistance to gasoline, diesel, and motor oil
- ✓ Excellent durability — 3 to 5 year service life in commercial applications
- ✓ Deep, rich black appearance that holds color well
- ✓ Low cost per square foot, especially in bulk
- ✓ Long track record — used in the US since the 1950s
Weaknesses
- ✗ Contains PAHs, classified as probable human carcinogens by the EPA
- ✗ Banned in over 30 municipalities across the US
- ✗ Runoff concerns — linked to elevated PAH levels in waterways
- ✗ Not suitable for cold-weather application
- ✗ Strong odor during application
- ✗ Brittle in extreme cold
IDEAL USE CASES: Industrial facilities, airports, bus terminals, and commercial properties in jurisdictions where it remains legal and fuel resistance is the primary concern.
COMMON BRANDS: GemSeal Coal Tar, Neyra Industries (STYRACO, KOAL-TAR), SealMaster, Brewer Company, Star Seal.
2Asphalt Emulsion (Petroleum-Based)
What it is: Asphalt emulsion sealcoat is made from the same bitumen that makes up the asphalt pavement itself — just liquefied, emulsified with water and additives, and reformulated for surface application. This category is often called "asphalt-based" or "petroleum resin" sealcoat.
How it works: The emulsion re-introduces fresh bituminous material to the oxidized surface layer, essentially replenishing what UV degradation has burned away. The film it forms is more flexible than coal tar but less chemically resistant.
Strengths
- ✓ Environmentally friendlier than coal tar — legal everywhere
- ✓ Better cold-weather flexibility
- ✓ Bonds extremely well to the existing asphalt substrate
- ✓ No toxic runoff concerns; easier disposal
- ✓ Good adhesion on freshly placed/milled asphalt
Weaknesses
- ✗ Poor resistance to petroleum spills
- ✗ Shorter service life than coal tar (2 to 3 years)
- ✗ Higher product cost per gallon than coal tar
- ✗ Less consistent deep-black finish
- ✗ More susceptible to tracking in hot weather
IDEAL USE CASES: Residential driveways, ban-state municipalities, areas adjacent to water, and northern climates with severe freeze-thaw cycles.
COMMON BRANDS: GemSeal (AE-series), EZ Street / EZ Seal, Latexite, Quikrete, Fabriko, Henry Company.
3Refined Tar (RT) Sealcoat — The Hybrid Category
This is a category that causes significant confusion. Some manufacturers market their product as "tar-based" but use refined tar rather than raw coal tar. Others blend coal tar with asphalt emulsion to create hybrid formulations that try to balance the fuel resistance of coal tar with the environmental profile of asphalt emulsion.
True refined tar products contain lower PAH concentrations and may be legal in some jurisdictions where pure coal tar is banned. However, regulations vary by municipality.
COMMON BRANDS: SealBoss, Neyra DURAFLEX.
4Acrylic / Polymer-Modified Sealcoat
What it is: Acrylic sealcoats use water-based acrylic polymer resins as their primary binder rather than coal tar or bitumen. They were originally developed for tennis courts and specialty surfaces but evolved into commercial use.
How it works: The acrylic polymer forms a tough, UV-stable film. Unlike bitumen-based products, acrylic resins are inherently UV-resistant.
Strengths
- ✓ Excellent UV resistance
- ✓ Legal everywhere, no PAH concerns
- ✓ Available in multiple colors
- ✓ Excellent adhesion to concrete
- ✓ Very flexible
- ✓ Resistant to many chemicals
Weaknesses
- ✗ Highest product cost (3x to 5x of coal tar)
- ✗ Not as resistant to gasoline/diesel as coal tar
- ✗ Less dramatic "jet black" appearance
- ✗ Can chip/flake if applied too thick
- ✗ Requires more surface prep
IDEAL USE CASES: Tennis/basketball courts, colored markings, airport runways edges, heavy UV exposure ban states.
COMMON BRANDS: SealMaster Acrylic, DecoCoat, Armor-Seal, StreetBond, ColorSeal.
Part 3: Polymer Modification — The Performance Multiplier
Across all four categories above, the single most impactful upgrade you can make to any sealcoat product is polymer modification. Adding rubberized latex polymers (SBR — Styrene Butadiene Rubber — is the most common) transforms the performance envelope in meaningful ways.
What polymer modification does:
- Increases flexibility, reducing cracking in temperature extremes
- Improves adhesion to the existing substrate
- Enhances abrasion resistance — suited to turning lanes
- Extends service life by 25–50% in most applications
- Improves resistance to freeze-thaw cycling
- Creates a more uniform, aesthetic finish
Most professional-grade sealcoats sold today include some level of polymer modification. Products marketed to DIYers often contain 1–3% polymer solids, while commercial-grade formulations commonly run 5–12%.
Key polymer-modified products worth noting:
- GemSeal CT-PLUS Polymer-modified coal tar with SBR latex; high-traffic standard.
- Neyra STYRACO Well-known SBR-modified coal tar product, trusted consistency.
- SealMaster Polymer Modified Commercial-grade SBR formulation, consistent nationwide.
- GemSeal AE-PLUS Polymer-modified asphalt emulsion for ban-state commercial uses.
- Brewer PolyTar Highly regarded for clean application characteristics.
Part 4: Brand Deep Dives
GemSeal Pavement Products
Most established name in professional sealcoating. Offers the broadest product line (coal tar, asphalt emulsion, polymer-modified) under one roof.
Who uses them: Large commercial contractors, national property management, municipalities.
Reputation: Consistently high quality with tight formulation control. Professional tier.
SealMaster
Operates as both manufacturer and franchise distribution system. Highly accessible nationwide with nearly 100 franchise locations.
Who uses them: Regional paving contractors, municipalities.
Reputation: Strong and reliable. Excellent local support and quick delivery.
Neyra Industries
Cincinnati-based, technically sophisticated. Strong product engineering, documented application guides, and robust technical support.
Who uses them: Mid-size and large contractors, particularly in the Midwest.
Reputation: Excellent among professionals; strong technical backing.
Rust-Oleum (Consumer)
High-volume DIY asphalt emulsion products sold at home improvement stores.
Best for: Homeowners with low traffic driveways.
Latex-ite / Driveway Armor
Consumer grade asphalt emulsion. Note: "Airport Grade" is a marketing label.
Best for: Residential driveways.
Brewer Company
Focused range of professional products including PolyTar. Contractor channel exclusive. Strong reputation for formulation consistency.
Who uses them: Professional contractors in Midwest/Southeast.
Reputation: Excellent, high loyalty among users.
Part 5: Application Rates, Dilution, and Coverage
One of the most misunderstood aspects of sealcoating is the relationship between dilution, application rate, and finished film performance.
Standard Commercial Mixing Specifications
- Dilution: 1 gallon concentrate : 0.25–0.35 gallons water (25–35%)
- Sand load: 3–5 lbs fine silica sand per gallon of diluted mix
- Coverage: 60–80 sq ft per gallon of diluted material, per coat
- Coats: 2 coats minimum on commercial surfaces
Cheap contractors add too much water to stretch coverage and reduce material cost. The result is a thin film with poor UV protection, short service life, and a grayish appearance. Any dilution beyond 35% water by volume on a commercial product is a quality red flag.
Part 6: Climate and Regional Considerations
Hot, Sunny (TX, FL, AZ, CA)
UV oxidation is the dominant threat. Coal tar's high resistance to UV degradation gives it a strong advantage. Polymer modification is recommended. Surface temperatures above 130°F can cause fresh sealcoat to bubble — early morning application is preferred.
Freeze-Thaw (MN, WI, NY, CO)
Flexibility is paramount. Polymer-modified asphalt emulsion often outperforms coal tar in extreme cold. In mixed climates, PM coal tar or high-SBR asphalt emulsion represents the best compromise.
Coastal / High-Humidity
Extended cure times are a challenge. High ambient humidity slows evaporation. In salt-spray environments, acrylic-based products show superior long-term adhesion and corrosion resistance.
High-Altitude
Intense UV radiation at elevation accelerates oxidation. Coal tar or acrylic products are preferable. Thin-film failures are more common due to rapid solvent evaporation.
Part 7: Environmental and Regulatory Landscape
As of 2025, coal tar sealcoats are prohibited in jurisdictions including Washington state, Washington D.C., Austin TX, San Francisco Bay Area, Minneapolis/St. Paul, and others. Contractors must maintain awareness of local ordinances.
The EPA has funded research documenting PAH contamination from runoff but hasn't issued a federal ban. The scientific consensus supports the connection in waterways.
The PCTC disputes some conclusions, advocating for responsible use. However, the practical reality is: if you're in a ban jurisdiction, near water features, or dealing with environmental clients, asphalt emulsion or acrylic products are the clear choice.
Part 8: Head-to-Head Comparison Table
| Category | Coal Tar | Asphalt Emulsion | Acrylic |
|---|---|---|---|
| Fuel Resistance | Excellent | Poor | Moderate |
| UV Resistance | Very Good | Moderate | Excellent |
| Flexibility / Cold | Fair | Good | Excellent |
| Appearance | Deep Black | Medium Black | Varies |
| Service Life | 3–5 Years | 2–3 Years | 3–6 Years |
| Environmental Safety | Concerns (PAH) | Clean | Clean |
| Legal Everywhere | No | Yes | Yes |
| Relative Cost | Low–Medium | Medium | High |
| DIY Friendly | Fair | Yes | No |
| Color Options | Black Only | Black Only | Many |
Part 9: Choosing the Right Product
High-quality PM asphalt emulsion (Latex-ite, Rust-Oleum) is best for environmental safety and adequate performance.
Professional-grade PM coal tar is the industry standard for fuel resistance and cost economics.
Professional-grade PM asphalt emulsion.
Coal tar where legal. Nothing else comes close to the required fuel resistance.
Acrylic sealcoat is your only option.
Part 10: Surface Preparation
Where Projects Succeed or Fail
No sealcoat product, regardless of brand or price, will perform well over a poorly prepared surface.
Crack filling
Cracks > 1/8 inch need dedicated hot/cold emulsion filler. Sealcoat bridges hairlines but will not fill structural cracks.
Oil spot treatment
Active petroleum stains must be primed (acrylic primer). Coal tar over heavy oil will fail to adhere and delaminate.
Cleaning
Must be free of dirt/dust/vegetation. Pressure washing and degreasing is the professional standard. Treat crack vegetation.
Edge concerns
Thick edges crack/peel due to differential thermal movement. Needs careful edging over curbs, borders, & transitions.
Temperature and Weather
Minimum 50–55°F ambient and rising. No rain within 24 hours. Violations of these parameters are the single most common cause of early sealcoat failure.
Conclusion
Sealcoating is not a commodity. The difference between a budget-grade DIY product and a professional polymer-modified formulation from a reputable manufacturer can mean an extra 2–3 years of service life — a significant return on a relatively modest investment.
The right answer depends on your jurisdiction, climate, traffic type, environmental priorities, and budget. For most commercial applications in non-ban states, PM coal tar from GemSeal, Neyra, or SealMaster is the best overall value. For residential use or ban-state commercial work, high-quality PM asphalt emulsion is the responsible choice.
THE THREE PRINCIPLES
"Buy commercial-grade, follow manufacturer mixing specifications, and prioritize surface preparation. Those three principles will determine 80% of your results regardless of which brand is on the bucket."