Most online sealcoat calculators give you a single coverage rate — usually somewhere around 80 to 100 square feet per gallon — without telling you which product that number applies to, whether it is for one coat or two, or where the number came from. The problem is that coverage rates vary significantly by product type and the number of coats applied. Coal tar emulsion (the most common residential sealer) covers 100 square feet per gallon per coat. Asphalt emulsion sealer covers 90. Acrylic sealer covers 80. Rubberized sealer covers 75. If your calculator assumes 100 square feet per gallon but you are buying acrylic sealer, you will be 25 percent short on pails when you get to the hardware store. Our calculator shows all four types at the same time, at your footage, so you can see the difference in pail count before choosing which product to buy.
The second thing every sealcoat calculator skips is the traction sand. Silica sand is mixed into sealer at a rate of approximately 2 pounds per gallon to add surface texture and prevent the sealed driveway from becoming dangerously slippery when wet. For a 16-gallon job (800 sq ft, 2 coats), that is 32 pounds of sand — less than one 50-lb bag, but you need to buy it specifically because sealer manufacturers almost never include sand in the can. Our calculator outputs the sand quantity in lbs and 50-lb bags so you can grab both items in a single hardware store visit.
Gallons per coat = total area (sq ft) divided by the coverage rate for the selected sealer type. Total gallons = gallons per coat times number of coats. Five-gallon pails = total gallons divided by 5, rounded up. Traction sand = total gallons times 2 lbs per gallon. Coverage per pail = (5 gallons times coverage rate) divided by number of coats.
01
Wait 12 Months After New Asphalt — and 24 Hours Between Coats
The most common sealcoating mistake is applying sealer too soon after new asphalt paving. Fresh asphalt contains volatile oils and resins that need to evaporate over 6 to 12 months as the asphalt cures to full hardness. Applying sealer during this period traps the volatiles inside the asphalt, preventing proper curing and causing the sealer to bubble, blister, and peel. Wait a minimum of 12 months after new paving — some manufacturers specify 6 months as the minimum, but 12 months is the professional standard for the best bond and longest-lasting seal. Between coats: allow a minimum of 24 hours of dry weather between the first and second coat. The first coat must be fully dry and harden to a non-tacky surface before the second coat is applied. In humid climates or cool weather (below 60 degrees F), extend the wait between coats to 48 hours. Never apply sealcoat when rain is forecast within 24 hours, when temperatures will drop below 50 degrees F overnight, or when the driveway surface is wet from recent rain. Sealcoat that gets rained on before drying turns gummy, washes away, and leaves a blotchy appearance that requires complete reapplication.
02
Edge Cracks Before Sealing — Sealer Does Not Fill Cracks
Sealcoat is a thin surface coating (typically 1/64 to 1/32 inch when dry) designed to seal the porous surface of the asphalt against water, UV degradation, and petroleum spills. It is not a crack filler. Any crack wider than a hairline (approximately 1/8 inch) that is covered with sealcoat without prior crack filling will remain an open crack beneath the sealer that allows water infiltration and freeze-thaw expansion. The sealer bridges over the crack with a thin film that tears within one to two seasons. The correct process: fill all cracks wider than 1/8 inch with asphalt crack filler (hot pour or cold-applied rubberized crack sealant from a caulk tube) at least 24 to 48 hours before sealcoating. Allow the crack filler to cure fully. Then apply sealcoat over the entire surface including the filled cracks. This sequence seals the surface and the cracks in a single pass. Crack filler costs approximately $5 to $15 per tube, and a typical residential driveway needs 2 to 6 tubes for normal cracking. This is the step most DIY sealers skip that most often leads to premature failure of the seal.
03
Coal Tar Is Banned in Many Cities — Know Your Local Rules
Coal tar sealcoat (the standard residential product throughout most of the US) has been banned for sale or use in a number of US cities and states due to its polycyclic aromatic hydrocarbon (PAH) content, which washes off sealed driveways into storm drains and affects aquatic ecosystems. Austin, Texas banned coal tar in 2006 — the first US city to do so. Washington DC, Minnesota, and a growing number of municipalities followed with similar restrictions. The EPA has flagged coal tar sealer as a significant PAH source in urban stormwater. Before purchasing coal tar sealer, check your city or county ordinances. Asphalt emulsion sealer (sold under brands like Latex-ite, SealMaster AE, and others) is the approved alternative in ban jurisdictions — it contains much lower PAH levels and performs comparably to coal tar for residential applications in most US climates. Acrylic sealers are PAH-free and perform well in high-UV climates like the Southwest but have a higher upfront cost. Our calculator shows all four sealer types with their coverage rates so you can see the quantity difference between types before choosing which product is appropriate for your location.
How many gallons of sealcoat do I need?+
Coverage per coat: coal tar emulsion = 100 sq ft per gallon; asphalt emulsion = 90 sq ft per gallon; acrylic = 80 sq ft per gallon; rubberized = 75 sq ft per gallon. For 2 coats: total gallons = (Area sq ft / coverage) x 2. For 800 sq ft with coal tar at 2 coats: (800 / 100) x 2 = 16 gallons = 4 five-gallon pails. Five-gallon pails are the standard purchase unit — one 5-gallon pail of coal tar sealer covers 250 sq ft at 2 coats. Add traction sand at 2 lbs per gallon: 16 x 2 = 32 lbs (1 bag of 50 lb silica sand).
How often should you sealcoat a driveway?+
Every 3 to 5 years for a residential asphalt driveway under normal use. Do not sealcoat more frequently than every 2 to 3 years — successive sealer coats build up a thick coating that eventually cracks, peels, and flakes off in sheets as the layers no longer bond to the underlying asphalt. Signs the driveway needs resealing: water no longer beads on the surface (pour a cup of water — if it soaks in rather than beading, the seal is depleted); the asphalt surface has turned gray or tan (UV oxidation); small hairline cracks are appearing on the surface; or the surface feels rough or gritty like fine sandpaper. The first sealcoat on new asphalt should be applied 12 months after paving.
What is the difference between coal tar and asphalt emulsion sealer?+
Coal tar emulsion is the traditional standard product for asphalt driveway sealing in the US. It is derived from coal tar (a byproduct of coal processing) and provides excellent resistance to gasoline, oil, UV, and water penetration. It is the most widely available and lowest-cost residential sealer. However, it contains polycyclic aromatic hydrocarbons (PAHs) that have led to bans in some US cities. Asphalt emulsion sealer uses asphalt cement (the same material the driveway is made from) as the base binder rather than coal tar. It has a lower PAH content, is legal everywhere including ban jurisdictions, and performs comparably to coal tar for most residential applications. It is slightly more porous and may need slightly more frequent reapplication in high-wear areas. Coverage: coal tar = 100 sq ft per gallon per coat; asphalt emulsion = 90 sq ft per gallon per coat. The main practical difference is that asphalt emulsion sealer is slightly less fuel-resistant than coal tar — in garages where fuel spills are common, coal tar (where legal) may be preferred for its fuel resistance.
What is traction sand and do I need to add it to sealer?+
Traction sand (silica sand, sharp sand, or masonry sand) is mixed into sealcoat at a rate of 2 lbs per gallon before application. The sand particles suspended in the sealer create a slightly textured surface when dry, providing better tire traction and reducing slipperiness, particularly when the sealed driveway is wet. A smooth seal coat applied without sand can be slippery to pedestrians and can cause tire spin on vehicles in wet or cold conditions. Sand is sold separately from most sealers — it is typically available in 50-lb bags at hardware stores or masonry supply houses. Do not substitute play sand, beach sand, or fine mason sand for sharp silica sand — these rounded, smooth particles do not provide adequate traction. Some premium sealer products include sand already blended in the can (labeled as “sand mix” or “with sand”) — check the label before purchasing separate sand.
Can I sealcoat a driveway myself?+
Yes. DIY sealcoating is one of the most accessible home improvement tasks for residential driveways. Equipment needed: a long-handled squeegee sealer applicator or a sealer brush/broom (both available at hardware stores for $20 to $40), a 5-gallon bucket for mixing sand into the sealer, painter’s tape and plastic sheeting for masking the garage door threshold and any concrete adjacent to the driveway. Process: clean the driveway (blow off debris, wash off oil spots with a degreaser), fill cracks with crack filler (24-48 hours before), mix sand into the sealer (2 lbs per 5-gallon pail), apply with the squeegee in long strokes along the driveway, apply a second coat perpendicular to the first (crossing pattern) 24 hours later. One person can seal a standard 800-sq-ft driveway in approximately 2 to 3 hours per coat. Professional sealcoating by a contractor costs approximately $0.15 to $0.30 per sq ft installed (about $120 to $240 for 800 sq ft), while DIY materials cost approximately $35 to $50 per pail = $140 to $200 for 4 pails. The DIY savings are modest but the process is straightforward for most homeowners.
How long does sealcoat take to dry?+
Surface dry time: 4 to 6 hours under normal conditions (70 to 80 degrees F, low humidity). Full cure time (before vehicle traffic): 24 to 48 hours after the final coat. In hot, sunny weather (above 85 degrees F), surface dry time can decrease to 2 to 4 hours, but the interior of the seal coat layer may take 24 hours to fully cure regardless of surface appearance. In cool weather (50 to 60 degrees F) or humid conditions, extend both dry time and cure time by 50 to 100 percent. Do not apply sealcoat when temperatures will fall below 50 degrees F overnight before the sealer has fully dried — cold temperatures prevent proper curing and can result in a sealer that remains tacky or washes away in the first rain. Keep foot traffic off the sealed area for 24 hours, and vehicle traffic off for 48 hours, to prevent tire tracks and footprints in the fresh sealer.
Is acrylic sealer better than coal tar for a driveway?+
In high-UV climates (the Southwest US, Florida, and other sunny regions), acrylic sealers perform better than coal tar because acrylic is specifically formulated to resist UV degradation and color fading, while coal tar tends to lighten and chalk in intense sun exposure. Acrylic sealer maintains a darker, more uniform black appearance longer in UV-intense conditions. In northern climates where UV is less intense and freeze-thaw resistance is the priority, coal tar emulsion performs comparably to acrylic at roughly half the material cost. The key trade-off: acrylic sealer covers approximately 80 sq ft per gallon per coat vs 100 sq ft for coal tar — meaning you need 25 percent more acrylic sealer (by volume) for the same area, and acrylic pails cost significantly more ($60 to $90 vs $35 to $50 per 5 gallons). For a budget-conscious residential homeowner in a northern US climate, coal tar emulsion (where legal) is the practical choice. For a homeowner in an HOA community concerned about appearance, or in a ban jurisdiction, acrylic or asphalt emulsion sealer is the appropriate selection.
How do I clean the driveway before sealcoating?+
Proper surface preparation is the most important step in sealcoating. The sealer must bond to a clean, dry, oil-free surface — anything between the sealer and the asphalt reduces adhesion and causes early peeling. Step-by-step cleaning: (1) Blow all loose debris, leaves, and dirt off the surface with a leaf blower. (2) Treat oil and gasoline spots: spray a commercial degreaser (Simple Green, Oil-Eater, or similar) on all oil stains, scrub with a stiff brush, rinse with water, and repeat. Multiple applications may be needed for old, set-in oil stains. Apply a coat of oil primer spot treatment (sold at hardware stores specifically for sealing oil spots before sealcoating) if spots are large or deeply penetrated. (3) If the driveway has weeds or vegetation growing through cracks, spray with a driveway weed killer 1 to 2 weeks before sealcoating. (4) Optionally, pressure wash the entire surface to remove any remaining surface dirt, grime, and loose asphalt particles. Allow the surface to dry completely (minimum 24 to 48 hours after washing) before applying sealer. A damp or moist surface will prevent the sealer from bonding. (5) Apply crack filler to all open cracks wider than 1/8 inch, allow to cure 24 to 48 hours, then sealcoat.
How many coats of sealcoat do I need?+
For a standard residential driveway in good condition that was last sealed 3 to 5 years ago: 2 coats is the standard application. The first coat fills and penetrates the oxidized surface of the old sealer; the second coat builds the surface film to the correct final thickness for weather and traffic protection. For a driveway that has never been sealed or has not been sealed in 7 or more years (very oxidized, gray surface): 2 coats minimum, with 3 coats preferred — the very porous oxidized surface absorbs the first coat with very little surface buildup, and the second and third coats provide the actual protective film. For a touch-up of a recently sealed driveway (within 2 to 3 years) with minor worn areas: 1 coat on the worn sections only, feathered into the surrounding good seal, is adequate. Our calculator’s coats selector adjusts the total gallons and pails linearly: each additional coat adds the same per-coat gallon count. The maximum practical coat count for asphalt sealers is 3 — more than 3 accumulated coats (from successive applications over years) leads to a coating that is too thick, cracks, and peels.
Does sealcoating prevent cracks in asphalt?+
Sealcoat significantly slows the development of surface cracking in asphalt by blocking the two primary causes of asphalt deterioration: UV oxidation (the sun’s ultraviolet light breaks down the asphalt binder, making it brittle and prone to cracking) and water infiltration (water that seeps into the asphalt surface softens the base material, causes freeze-thaw expansion in cracks, and accelerates deterioration). By blocking UV and water from reaching the asphalt surface, sealcoat extends the asphalt’s flexibility and structural integrity. However, sealcoat does not prevent or repair cracks that have already formed — it will bridge over hairline cracks temporarily, but any crack wider than 1/8 inch must be filled before sealing. Sealcoat also does not address structural failure of the base material, subgrade settlement, or root intrusion — these causes of cracking require full-depth repair, not sealing. Think of sealcoat as sunscreen for asphalt: it protects the surface from environmental degradation and extends the life of the pavement, but it does not make structural repairs and cannot prevent cracking caused by movement or load failure.
How long does sealcoat last on a driveway?+
A properly applied 2-coat sealcoat on a clean, crack-filled driveway surface lasts 3 to 5 years under normal residential vehicle traffic in a moderate climate. Factors that extend sealer life: three coats rather than two, a sand additive for traction (sand also slightly increases sealer thickness), minimal vehicle traffic (especially avoiding sharp turns from large vehicles which shear the sealer surface), and protection from petroleum spills. Factors that shorten sealer life: high UV exposure (South Florida, Arizona, southern California), high temperature extremes that cause daily expansion/contraction, heavy vehicle traffic (trucks, delivery vehicles), aggressive tire compounds from high-performance vehicles, and steep driveway slopes where water collects and freezes. In the extreme heat of Phoenix or Las Vegas (where pavement surface temperatures can exceed 150 degrees F in summer), even a properly applied coal tar sealer may soften and track tire marks in the hottest months — a slightly thicker acrylic sealer or a higher-solid-content coal tar product is recommended for these climates.
What is rubberized sealcoat and when should I use it?+
Rubberized sealcoat is a coal tar or asphalt emulsion base modified with rubber polymers (typically styrene-butadiene rubber or crumb rubber from recycled tires) to improve flexibility, adhesion, and crack-bridging ability. The rubber additive makes the dried sealer more elastic than standard sealer, allowing it to flex with hairline cracks rather than cracking over them. Rubberized sealers are the preferred choice for: driveways in climates with severe freeze-thaw cycling (where thermal expansion and contraction is greatest), older driveways with many fine hairline cracks that would otherwise telegraph through standard sealer, and driveways with minor movement from tree roots or settling. The trade-offs: rubberized sealer covers slightly less area per gallon (approximately 75 sq ft vs 100 sq ft for standard coal tar) because the rubber content adds bulk, and it costs 20 to 40 percent more per gallon than standard coal tar sealer. For a driveway in good condition in a mild climate, standard coal tar or asphalt emulsion sealer is more economical. For a northern US driveway with active frost heave or a driveway that repeatedly develops fine cracks at the same locations, the crack-bridging performance of rubberized sealer justifies the additional cost.
What temperature do I need to sealcoat a driveway?+
Minimum application temperature: 50 degrees F (10 degrees C) at the time of application and for the following 24 hours. Sealcoat applied below 50 degrees F will not cure properly — the water in the emulsion cannot evaporate quickly enough, resulting in a sealer that remains soft, muddy, or washes away in the first rain. Do not apply sealer when temperatures will drop below 50 degrees F overnight within 24 hours of application. Ideal temperature range: 60 to 85 degrees F with low humidity and no rain forecast for 24 hours. Above 90 degrees F, sealcoat dries very quickly (which can be advantageous for fast second-coat application) but requires working in shorter sections and moving quickly to avoid lap marks from the sealer drying before the sections are joined. Most sealcoat manufacturers specify a minimum of 50 degrees F with rising temperature (a morning application on a warming day) as optimal. Avoid applying in direct afternoon sun on very hot days (above 95 degrees F) as the sealer may dry too quickly at the squeegee edge and leave drag marks. In the US, the ideal sealcoating season is late spring through early fall — May through September in northern states, October through April in the Gulf Coast and Southwest.
How much does professional sealcoating cost?+
Professional driveway sealcoating by a licensed paving contractor in the US (2026): $0.15 to $0.30 per sq ft for standard 2-coat coal tar application, or $120 to $240 for a standard 800-sq-ft residential driveway. For comparison, DIY material cost for the same project runs approximately $140 to $200 for 4 pails of coal tar sealer plus sand. The professional cost savings over DIY are relatively small (typically $0 to $100) compared to the 2 to 3 hours of labor needed. Most homeowners choose DIY for sealcoating because the material and process are straightforward, the cost savings justify the effort, and the result is virtually indistinguishable from professional work on a standard driveway. Professional sealcoating makes more sense when: the driveway has complex geometry or many obstacles (planters, drain grates, cars that cannot be moved), the homeowner has physical limitations that make prolonged kneeling and squeegeeing difficult, or the property is being sold and a professional invoice is desired for disclosure purposes. Contractors also have access to commercial-grade sealer mixes (higher solids content, lower water content) that provide slightly better durability than the same-brand retail products, which partially justifies the labor cost.
Where is coal tar sealcoat banned in the United States?+
Coal tar sealcoat has been banned for sale or use in a growing number of US jurisdictions due to its polycyclic aromatic hydrocarbon (PAH) content, which washes off driveways into stormwater and has been shown to harm aquatic ecosystems. Known ban jurisdictions include: Austin, Texas (2006 — first US city to ban coal tar); Washington DC; Minnesota (statewide ban); and a number of cities in Wisconsin, Oregon, and the Great Lakes region. Retailers in these areas may not stock coal tar sealer at all. The EPA has recognized coal tar pavement sealants as a significant source of PAH contamination in urban waterways. For an up-to-date list of ban jurisdictions, consult the USGS
Coal Tar Sealcoat research page. If you are in or near a ban jurisdiction, choose asphalt emulsion sealer (90 sq ft per gallon per coat), acrylic sealer (80 sq ft per gallon per coat), or rubberized asphalt sealer (75 sq ft per gallon per coat) — all are legal alternatives available at most hardware stores. Our calculator supports all four sealer types so you can switch to an approved product and see the adjusted pail count for your driveway area.
Can I seal a concrete driveway?+
Asphalt sealcoat (coal tar, asphalt emulsion, acrylic asphalt sealer) is designed specifically for asphalt surfaces and should not be applied to concrete. It does not bond well to concrete and will peel and flake within weeks to months. Concrete driveways use different sealing products: penetrating silane or siloxane sealers (penetrate the pores and repel water without changing the appearance), acrylic concrete sealers (clear or semi-gloss film that protects the surface), and epoxy floor coatings (for garage floors). If you have a concrete driveway, look for products specifically labeled for concrete or masonry — not asphalt sealcoat. Mixed driveways (part asphalt, part concrete) are common, particularly where the concrete apron transitions to asphalt at the street or garage. In these situations, mask the concrete sections before applying asphalt sealer to the asphalt sections, and apply a separate concrete sealer to the concrete sections. Our sealcoat calculator is designed for asphalt driveways only.