# Driveway Sealing Installation: What It Involves > A step-by-step guide to professional and DIY driveway sealing installation, including prep, repairs, application, and curing. Canonical: https://drivewaysealinglab.com/driveway-sealing-installation/ Last updated: 2026-11-08 Driveway sealing installation is the process of preparing an asphalt surface and applying a protective sealcoat to slow oxidation and water intrusion. It starts with inspecting the base, not with opening a bucket of sealer. If the base is failing, sealing over it only hides the problem until the coating cracks. ## What Driveway Sealing Installation Means Installation refers to the full sequence of work needed before a driveway can be sealed safely. That sequence includes surface inspection, cleaning, crack filling, pothole patching, oil-spot treatment, sealcoat application, and curing. A contractor or homeowner who skips the early steps is not installing a sealcoat; they are painting over damage. Sealcoat is not structural. It does not add load-bearing strength to asphalt. It is a sacrificial layer that shields the binder from ultraviolet rays, oxygen, water, and vehicle fluids. Understanding that distinction prevents the mistake of using sealer as a substitute for repair. ## Step 1: Inspect the Base Before Any Sealer The first job of any driveway sealing installation is diagnosing base failure. Walk the driveway and look for alligator cracking, sunken areas, rutting under tire paths, and water pooling after rain. These are signs that the aggregate base beneath the asphalt may be unstable or compacted poorly. Sealcoat cannot fix a soft base. If the base moves under vehicle weight, the asphalt above it will flex and crack, and the sealcoat will crack with it. Areas with base failure need to be excavated, re-compacted, and patched with hot or cold mix asphalt before sealing begins. This is why Driveway Sealing Lab recommends evaluating repair needs first. For more on that distinction, see our guide to [driveway sealing vs asphalt sealcoating](https://drivewaysealinglab.com/driveway-sealing-vs-asphalt-sealcoating/). ## Step 2: Clean and Prep the Surface A sealcoat will not bond to dirt, oil, or loose gravel. Preparation starts with sweeping or blowing the surface clean. Next, treat oil and gasoline spots with a degreaser or oil-spot primer. Untreated petroleum stains create voids where the sealer will peel within weeks. Edges should be trimmed back so grass and soil do not touch the fresh coating. Any vegetation growing through cracks must be removed and the crack treated before filling. Surface prep often takes longer than the actual sealing, but it determines whether the job lasts one season or several. ## Step 3: Repair Cracks and Potholes Cracks wider than about one-quarter inch should be filled with hot-pour or cold-pour crack filler before sealcoating. Smaller hairline cracks can often be bridged by the sealcoat itself, but larger openings need dedicated filler. Contractors typically charge $2–$5 per linear foot for crack filling. Potholes require more work. The damaged area is squared off, cleaned, filled with asphalt patch material, and compacted. Pothole repair generally runs $100–$400 each, depending on size and depth. Sealing over an unfilled pothole leaves a depression that holds water and breaks the coating prematurely. For detailed repair steps, see our article on [driveway sealing repair](https://drivewaysealinglab.com/driveway-sealing-repair/). ## Step 4: Apply the Sealcoat Sealcoat is applied in thin, even coats using a squeegee, brush, or spray system. Most driveways receive two coats. The first coat seals the porous asphalt; the second builds wear thickness. Applying one thick coat instead of two thin ones leads to uneven drying, tracking, and early failure. Weather matters. Sealcoat should be applied when air and pavement temperatures are at least 50°F and rising, with no rain in the forecast for at least 24 hours. Direct sun and wind help the water in the emulsion evaporate, but extreme heat can cause the surface to skin over before the lower layers cure. ## Step 5: Cure and Reopen to Traffic After the final coat, the driveway needs time to cure. Under normal conditions, foot traffic can return after 24 hours and vehicle traffic after 48 hours. Cool, humid weather extends that window. Driving on soft sealcoat leaves tire marks and can pull the coating off in patches. During cure, keep sprinklers off and avoid turning steering wheels while the car is stationary. Power steering on fresh sealcoat can tear the film. Once cured, the surface should have a uniform matte or satin appearance, depending on the product used. ## Cost Arithmetic for a Typical Driveway Costs depend on whether the work is professional or DIY. Consider a two-car driveway measuring 20 feet by 40 feet, or 800 square feet. Professional installation at $0.15–$0.30 per square foot: - Low: 800 × $0.15 = $120 - High: 800 × $0.30 = $240 DIY materials at $0.05–$0.12 per square foot: - Low: 800 × $0.05 = $40 - High: 800 × $0.12 = $96 Add crack filling. If the driveway has 50 linear feet of cracks at $2–$5 per linear foot: - Low: 50 × $2 = $100 - High: 50 × $5 = $250 Add one pothole repair at $100–$400. A complete professional job with repairs could therefore range from roughly $320 to $890 for this size driveway, while a DIY job with materials only might fall between $140 and $446. These are estimates; local labor rates and driveway condition change the final price. For broader pricing context, see our articles on [how much does driveway sealing cost](https://drivewaysealinglab.com/how-much-does-driveway-sealing-cost/) and [driveway sealing cost per square foot](https://drivewaysealinglab.com/driveway-sealing-cost-per-square-foot/). ## When Not to Seal Sealcoat is not appropriate for every driveway. New asphalt should cure for at least 90 days before sealing so oils can evaporate. Driveways with extensive base failure, large areas of alligator cracking, or severe rutting need overlay or replacement before surface treatment. An asphalt overlay costs $3–$7 per square foot, while full replacement runs $8–$15 per square foot. Sealing every year is unnecessary and can build up a thick film that peels. Most driveways perform well with sealing every two to four years, depending on traffic and climate. For guidance on upkeep between applications, see our [driveway sealing maintenance](https://drivewaysealinglab.com/driveway-sealing-maintenance/) article. ## DIY vs Professional Installation Homeowners with small driveways, good weather, and time can handle DIY sealing. The material cost is lower, but the equipment—squeegees, brushes, blowers, and crack-fill tools—adds expense. Mistakes in prep or application show up quickly as streaks, peeling, or uneven texture. Professional contractors bring commercial spray or squeegee equipment, experience with base diagnosis, and liability coverage. For large driveways, extensive cracking, or uncertain base conditions, professional installation usually costs more upfront but reduces the risk of early failure. Homeowners interested in doing it themselves can review our [DIY driveway sealing](https://drivewaysealinglab.com/diy-driveway-sealing/) guide. ## Longevity and Realistic Expectations Sealcoat is maintenance, not reconstruction. A properly installed coat on a sound base typically lasts two to four years before wear shows in wheel paths. Heavy truck traffic, snowplow scraping, and deicing chemicals shorten that life. Sealcoat does not stop cracks from ever returning; it slows the rate at which new cracks form. Expect to re-seal on a regular cycle. Treat each installation as an opportunity to re-inspect the base, fill new cracks, and address drainage issues before they become structural problems. For typical service intervals, see our article on [how long does driveway sealing last](https://drivewaysealinglab.com/how-long-does-driveway-sealing-last/).