DIY vs Professional Driveway Sealing

The worst-sealed driveways we see are not DIY jobs. They are the ones done by the cheapest contractor in the neighbourhood. The best are a toss-up between a careful homeowner on a small drive and a good crew on a big one.

1. The Real Cost Comparison

Start with the number everyone wants. We will use a typical two-car driveway of about 600 square feet, roughly 20 by 30 feet, and give ranges, because product, region and condition move the figures around a lot.

DIY materials: 10 to 25 cents per square foot

Two coats of a mid-grade asphalt emulsion sealer from a big-box store, applied at the rate on the pail, works out at around 10 to 15 cents per square foot for the sealer alone. Step up to a premium product with sand and polymer already in it, or a coal tar blend where they are still sold, and you are at 15 to 20 cents. Add a few tubes of pourable crack filler, an oil-spot primer, a squeegee-broom combination tool, a drill paddle for mixing and a pair of gloves, and a first-time DIYer on a 600 square foot driveway is spending somewhere between 90 and 160 dollars all in. Someone with the tools already spends 60 to 120 dollars.

That figure assumes you buy enough sealer to apply it properly. The most common way homeowners make DIY look cheaper than it is involves stretching two pails over a driveway that needs three, and the false economy shows up as streaks and a coat that does not last. Use our driveway sealer calculator to get the quantity right before you compare prices.

Professional: 15 to 50 cents per square foot

A professional sealcoat on a residential driveway runs from about 15 cents per square foot in low-cost rural markets for a basic spray job, to 50 cents or more in expensive metro areas or for a job with extensive crack repair, patching and premium product. The broad middle is 20 to 35 cents. For a 600 square foot driveway that is 120 to 210 dollars in most places, with a floor of around 150 dollars because most outfits have a minimum charge to cover travel and setup. Add 1 to 3 dollars per linear foot for hot-pour crack sealing, and 2 to 5 dollars per square foot for patching alligatored sections, and a driveway in poor condition can run to 400 to 600 dollars.

So the honest comparison for a healthy 600 square foot driveway is roughly 100 to 150 dollars DIY against 150 to 300 dollars professional. Hiring costs about double. Whether that doubling is worth it depends entirely on what you get for it, and that is what the rest of this article is about. For a fuller breakdown of professional pricing by region and driveway type, see how much it costs to seal a driveway.

The cost people forget: frequency

A coat that lasts two years costs twice as much per year as one that lasts four. A DIY job with retail sealer generally needs redoing every two to three years; a well-executed professional job with a sand-loaded commercial mix goes three to four, sometimes five in a mild climate. Over a decade the gap in cost per year is narrower than the sticker prices suggest, though DIY still usually wins on pure money. Our guide to how often to seal a driveway covers the realistic intervals.

2. The Time It Actually Takes

Sealer marketing shows someone spreading a pail in twenty minutes on a sunny afternoon. The spreading is indeed twenty minutes. The job is a day.

For a 600 square foot driveway, a realistic first-time DIY schedule looks like this. Trim the grass back from the edges and sweep: 30 minutes. Degrease oil spots, pressure wash or scrub the whole surface, and blast out the cracks: 1.5 to 2 hours. Let it dry: several hours, ideally overnight, because sealing a damp driveway is one of the classic failures. Fill the cracks and let the filler set: 1 hour of work plus a wait of anything from an hour to a day depending on product and depth. Mask edges and cut them in with a brush: 30 minutes. First coat: 45 minutes to an hour. Wait for it to dry: 4 to 8 hours. Second coat: 45 minutes. Clean tools: 15 minutes. Keep the car off it: 24 to 48 hours.

That is five to six hours of actual labour spread over a day and a half, plus two days without the driveway, and it assumes the weather cooperates. Most people prep on Saturday morning, seal Saturday afternoon and Sunday morning, and park on the street until Tuesday. The full sequence is laid out in how to seal a driveway.

A two-person crew does the same driveway in 60 to 90 minutes on site, including crack fill and edging, because their prep is a blower and a wire-brush wheel rather than a pressure washer, their crack fill is hot and sets in minutes, and their sealer goes on from a spray wand or a squeegee machine in one pass. They may come back the next day for a second coat, or they may apply one heavier coat of a thicker commercial mix, which is a legitimate approach with the right product. Either way, the homeowner's time cost is about ten minutes of moving the cars.

If your weekend time is worth 30 dollars an hour to you, the DIY saving of 100 to 150 dollars is spent entirely on labour and you have broken even. If you enjoy the work, or your weekends are your own, the saving is real. Be honest with yourself about which of those describes you.

3. The Quality Gap: What Pros Have That You Don't

A good contractor does not just do the same job faster. There are four things they have that a homeowner mostly cannot buy at retail, and they account for most of the durability difference.

Commercial-grade sealer, mixed to spec

Contractors buy asphalt emulsion or coal tar concentrate by the 55-gallon drum or the tote from suppliers such as SealMaster, GemSeal, Neyra or STAR, and mix it on site with a specified amount of water, 2 to 5 pounds of silica sand per gallon, and a latex or polymer additive that improves flexibility, cure speed and colour. The finished mix has a higher solids content than a retail pail, and the sand gives traction, fills surface texture and dramatically improves wear resistance in tyre paths. A retail pail is a ready-to-use compromise designed to pour easily and spread with a squeegee. Some premium retail products include sand and polymer, and they are noticeably better than the base grades, but they are still not what comes out of a well-run contractor's tank. We compare the categories in commercial asphalt sealer.

Hot-pour crack filling

This is the biggest single quality difference and the one homeowners cannot replicate. Cracks wider than about a quarter inch need a rubberised filler that stays flexible through freeze-thaw cycles and bonds to the crack walls. The pourable cold filler sold in tubes and jugs at retail does an acceptable job on hairline and narrow cracks, but it shrinks as it dries, needs multiple applications on anything deep, and tends to pull away within a couple of winters. Contractors use hot-pour rubberised crack sealant melted in a kettle to around 375°F and applied with a pour pot or a wand. It fills the crack in one pass, sets in minutes, does not shrink, and lasts for years. On a cracked driveway, the crack fill matters more than the sealer, and this is where the pro earns the premium. Our guide to filling driveway cracks before sealing covers what a homeowner can realistically do with retail products.

Application equipment

A spray rig lays down a consistent film thickness across the whole driveway in a fraction of the time, with no lap marks and no pushed-thin patches at the end of every squeegee pull. A ride-on or walk-behind squeegee machine does the same with a heavier sand-loaded mix. Both keep a wet edge automatically because the whole surface is coated in minutes. A homeowner with a hand squeegee is racing the sun on a hot day, and the results show in streaks and lap marks. The trade-offs between the two methods are in spray vs squeegee driveway sealer.

Judgement

A contractor who has sealed a thousand driveways knows without a thermometer that the pavement is too hot, knows that the grey area near the garage is oxidised and will drink a first coat, knows the forecast for this afternoon is more reliable than the one for tomorrow, and knows that the low spot by the mailbox will hold water and needs the sealer worked into it rather than over it. None of that is on the pail. It is the difference between a job that lasts four years and one that lasts two, and it is also the thing that separates a good contractor from a bad one, which brings us to the two sections that follow.

4. Where DIYers Go Wrong

When a homeowner-sealed driveway fails early, it is almost always one of these. None of them is a skill problem; they are all shortcuts.

Prep

Sealer bonds to clean asphalt. It does not bond to dust, pollen, dried mud, algae, oil or old flaking sealer. The pail says clean the surface and the homeowner sweeps it. On the driveways we have looked at, the ones that peeled in the first year had visible dirt under the lifted film every time. A pressure wash or a stiff scrub with a driveway cleaner, oil spots degreased and primed, cracks blown out, and a full day to dry: that is the minimum, and it is most of the work. Our guide to cleaning an asphalt driveway before sealing goes through it.

Thin coats and stretched pails

Buying two pails for a three-pail driveway, adding a hose-full of water to make it go further, or pushing the squeegee until the puddle runs dry all produce the same thing: a coat that is half the intended thickness, dries grey-brown, streaks, and is gone from the tyre tracks by spring. The pail's coverage rate is not a suggestion. One properly applied coat outperforms two starved ones, and two proper coats is the standard. See how many coats of driveway sealer for why.

Wrong weather

Sealing on the one free weekend regardless of forecast is the third leg. Too cold and the emulsion never cures; too hot and it flashes into lap marks; rain within a few hours and it washes into the street; a 42°F night and it powders by January. We wrote a whole guide to what temperature to seal a driveway because this decides more outcomes than the product does.

Skipping the cracks

Sealer is a surface coating a few thousandths of an inch thick. It does not bridge cracks, fill them, or stop water getting into them. A homeowner who seals over open cracks gets a driveway that looks great for a month and then shows every crack again as water works through and the edges fray. Fill first, always.

Sealing too often

The opposite problem. Enthusiastic DIYers who reseal every year build up a thick, brittle layer that cracks and peels in sheets. Asphalt sealer is not paint; it should only go on when the old coat has worn thin. Every two to three years is plenty for most retail products.

5. Where Contractors Cut Corners

Residential sealcoating has a low barrier to entry: a used tank, a truck and a flyer. Plenty of operators are excellent. Plenty are not, and the bad ones are consistently bad in the same ways.

Watered-down sealer

Concentrate is meant to be diluted with a specific amount of water, typically 20 to 30 per cent. Cutting it 50 or 60 per cent halves the material cost and lets a crew quote a price nobody else can match. The coat dries thin, brown-grey rather than black, and is worn through in the tyre paths within a year. If a quote is far below the others, this is usually why. A coat that goes on looking watery and dries looking dusty is the tell.

No sand, no additive

Sand and polymer cost money and take time to mix. Skipping them produces a smooth, glossy coat that looks lovely on day one, is slippery when wet, shows every tyre scuff, and wears fast. Ask what the sand loading is. Two to three pounds per gallon is normal for residential work; zero is a corner cut.

No crack fill, or cold crack fill

Hot crack sealing takes time and a kettle. A spray-and-run outfit either skips it entirely and sprays sealer straight over the cracks, which hides them for a season, or squirts a bit of cold filler in the widest ones and calls it done. If crack fill is not itemised on the quote with a linear-foot figure, assume it is not happening properly.

No prep

A leaf blower is not cleaning. Oil spots need degreasing and priming or the sealer lifts off them within weeks. Alligatored areas need patching or they show through in a season. Oxidised, grey asphalt needs a first coat that soaks in and a second that finishes; a single spray pass over that surface does neither. Watch what they do in the first fifteen minutes; if the tank is running before anything but a blower has touched the driveway, the job is not being done properly.

Spray-and-run

The classic: a truck appears unannounced, offers to seal your driveway today because they have sealer left over from a job down the street, sprays it in fifteen minutes, collects cash and is gone. No masking, sealer on the sidewalk and the garage door, no crack fill, a mix that is mostly water. This is the model that gives the whole trade a bad name. Nobody legitimate has leftover material they need to get rid of at a discount today.

Overselling

The other direction. A driveway that needs a reseal is told it needs resurfacing; hairline cracks are described as structural; the customer is upsold to annual sealing that will eventually cause the peeling problem described above. A contractor who tells you the driveway does not need sealing yet is one to keep.

6. How to Vet a Sealcoating Contractor

You do not need to become an expert. You need to ask seven questions and pay attention to how they are answered.

What product are you using, and at what dilution? A good contractor will name the manufacturer and product and tell you the mix without hesitation. Evasion or "our own blend" is a red flag.

How much sand per gallon, and do you use an additive? Expect a number. Two to three pounds is typical. Latex or polymer additive is a bonus.

How do you fill cracks? The answer you want is hot-pour rubberised sealant, itemised per linear foot. Cold pourable filler for a few hairlines is acceptable; sealing straight over cracks is not.

What prep do you do? Listen for cleaning beyond a blower, oil-spot treatment and priming, and edge trimming. Ask how they protect the concrete and the garage door.

One coat or two, and how long do you wait between? Two coats, or one heavy coat of a sand-loaded mix, are both legitimate. A single thin spray coat is not.

What weather do you work in? Anyone who says they will seal regardless of forecast is telling you they do not care whether it lasts. A good outfit reschedules for rain and cold.

Are you insured, and do you have local references I can drive past? Liability insurance protects your car and your neighbour's. Driveways sealed two or three years ago that still look good are the best reference there is.

Then get the answers in writing on the quote: product, mix, sand, crack fill footage, number of coats, cure time before traffic, and price. Pay when it is done and dry, not before. Be suspicious of any price much below 15 cents per square foot for a job with crack fill, and of door-knockers with leftover material. Three quotes is enough to see the spread.

7. When DIY Makes Sense and When to Hire

Do it yourself when

The driveway is small. Anything up to about 800 square feet is a comfortable day's work for one person with a squeegee. The economics of DIY are strongest here, because contractors' minimum charges make small driveways expensive per square foot to hire out.

The asphalt is healthy. A driveway under about ten years old, with a firm surface, a few hairline cracks and nothing wider than a quarter inch, needs a reseal and nothing more. Retail crack filler handles hairlines and retail sealer handles the surface. There is nothing here a pro brings that you cannot manage.

It is flat or gently sloped. Squeegee work is easy on a flat drive and gets harder fast as the grade increases, because the sealer runs and pools at the bottom.

You have the time and the weather. A free weekend with a good forecast, or the flexibility to wait for one, is essential. If you have to seal on a specific date regardless of conditions, hire someone who can reschedule around the weather for you.

You will actually do the prep. If you are the sort who will pressure wash, degrease, fill and wait a day, you will get a good result. If you are the sort who will sweep and pour, hire it out; the pro's blower-only prep is at least paired with a better product.

Hire a professional when

The driveway is large. Above about 1,200 square feet, hand squeegee work becomes a two-day slog with a very real risk of lap marks as the sun moves, and the per-square-foot price of a pro comes down. A long rural drive or a three-car turnaround is contractor territory.

It has real cracks. Anything wider than a quarter inch, anything deep, and anything alligatored needs hot crack fill and possibly patching. Retail products will not hold. Sealing over poorly filled cracks wastes the sealer, and a homeowner's cold filler that fails can make the eventual hot repair harder. Our guides to filling large cracks and sealing a cracked asphalt driveway will help you judge how bad yours is.

It is steeply sloped. Sealer runs. On a grade steep enough that you would not want to walk down it wet, a hand squeegee produces thin coverage at the top and a pool at the bottom, and a spray rig with an experienced operator is the only good way to coat it.

It is heavily oxidised. A grey, dry, ravelling surface that sheds loose stones under a fingernail needs a rejuvenator or a heavy first coat of a commercial mix that soaks in and binds it, followed by a sand-loaded finish coat. Retail sealer on that surface soaks in and disappears. If the asphalt is genuinely crumbling, sealing is the wrong treatment altogether and you are into repair or resurfacing; see how to fix a crumbling asphalt driveway.

You have drainage problems. Low spots that pond need to be addressed before sealing, and a contractor can patch and feather them. Sealing a puddle gets you a pale, weak spot that fails first.

Your time is worth more than the saving. There is nothing wrong with paying 150 dollars to have your Saturday back. Just pay a good contractor, not the cheapest one.

The hybrid

One option we like: hire a contractor for the crack fill and patching in the first year, when the driveway needs the hot kettle, and take on the routine resealing yourself in the years that follow while the cracks are held. You get the one thing you cannot do at retail, and you keep the recurring cost down. Not every contractor will do crack fill alone, but many will, particularly in the off-season.

Whichever you choose, the underlying question of whether sealing is worth doing at all on your particular driveway is a fair one, and we take it up in sealing an asphalt driveway: pros and cons.

Frequently Asked Questions

Related Driveway Sealer Guides

• How Much Does It Cost to Seal a Driveway? — professional pricing broken down by region and condition.
• How to Seal a Driveway — the full DIY method if you decide to take it on.
• Sealing an Asphalt Driveway: Pros and Cons — whether sealing is worth doing at all.
• Commercial Asphalt Sealer — what is actually in a contractor's tank and how it differs from a retail pail.
• Spray vs Squeegee Driveway Sealer — the two ways pros apply it and what each does to the finish.
• Best Asphalt Driveway Sealer Reviews — the retail products worth buying if you go DIY.