A driveway can look fine one year and faded or cracked the next, especially after a Minnesota winter. If you want to protect the asphalt without making the job more complicated than it needs to be, this guide explains the preparation, repairs, application, and timing to consider.
What sealing can and cannot do
An asphalt driveway can look tired long before it is ready for replacement. The surface may fade from black to gray, collect small stains, or develop a few narrow cracks. Sealing can help protect sound asphalt from sun, moisture, and everyday spills, but it is not a cure for every type of damage.
If you are wondering how do you seal an asphalt driveway, start by checking its condition rather than buying a bucket of sealer. A sealcoat is a thin protective layer. It does not rebuild a weak base, level deep ruts, or fix potholes. Those problems need repair first.
Choose the right time and conditions
Weather matters because the coating needs suitable conditions to dry and cure. Choose a period with dry weather and temperatures within the product label’s range. Cool nights, high humidity, shade, and unexpected rain can all slow drying.
In Minnesota, the useful sealing season is generally during the warmer months. Do not rely on a calendar date alone. Check the forecast for the full drying period and follow the manufacturer’s instructions. If overnight temperatures are dropping or rain is likely, wait for a better window.
Inspect the driveway before starting
Walk the entire surface and look for cracks, loose aggregate, low spots, oil stains, and areas where the asphalt is breaking apart. Mark damaged spots so you do not overlook them while cleaning. If cracks are wide, edges are crumbling, or water sits in depressions, ask a paving professional whether repairs are needed before sealing.
Fresh asphalt usually needs time to cure before a sealcoat is applied. The exact wait depends on the mix, weather, and installer guidance. Sealing too early can interfere with the surface settling and may lead to a poor finish.
Clean and prepare the surface
Good preparation often makes the difference between a coating that bonds well and one that peels or wears unevenly. Remove leaves, grass, loose gravel, dirt, and other debris with a stiff broom or blower. Pay attention to the edges and the area where the driveway meets the garage or sidewalk.
Treat oil and fuel spots with a cleaner designed for asphalt and follow its directions. Ordinary sweeping may not remove oily residue, and sealer may not stick properly to contaminated areas. Allow the surface to dry fully after any washing or spot treatment.
Driveway surface preparation also means checking that old, loose coating is not flaking away. Applying another layer over peeling material can trap a problem rather than solve it. If a large area is blistered or peeling, get advice before proceeding.
Repair cracks and damaged areas first
Sealcoat should not be used as a substitute for crack repair. Small cracks can allow water to reach the base beneath the pavement, where freeze-thaw cycles may contribute to movement and further damage. Use a crack product suited to the crack size and the conditions, and follow its preparation and curing directions.
Cracks that move with temperature changes may need a flexible sealant. Larger openings, crumbling edges, potholes, and alligator-shaped cracking can indicate deeper trouble. A patch may be necessary, and extensive base failure may call for a more substantial repair. Understanding asphalt crack sealing vs. patching can help you identify which repair questions to ask.
Let repairs set for the time specified by the product or contractor before coating over them. Rushing this step can weaken the finished job.
Apply the sealer carefully
Read the product label from start to finish. Stir the material as directed and use the recommended applicator, such as a commercial squeegee or brush. Work in manageable sections and keep the coating even. A very thick layer does not automatically provide better protection; excessive application can dry poorly or peel.
Protect garage doors, siding, sidewalks, landscaping, and nearby surfaces from splashes. Keep children, pets, and vehicles away from the work area. Do not let runoff enter storm drains, and follow local disposal instructions for leftover product and cleaning materials.
Many driveways need one or two thin coats depending on the product and surface condition. Do not add another coat simply because the first one looks lighter in a shaded area. Follow the specified coverage rate and recoat timing.
Allow enough time for drying and curing
Drying and curing are not exactly the same. A surface may feel dry while the coating is still developing its final properties. Keep foot traffic and vehicles off the driveway for the period listed on the product label. Shade, humidity, and cooler weather can extend that period.
Once the driveway is back in use, avoid sharp turns while a fresh coating is still tender. Keep sprinklers from spraying the surface during the recommended period. If you see tracking or tire marks, check the product instructions before trying to scrub or repair the area.
When professional help makes sense
DIY sealing can be reasonable for a small, sound driveway when you have the time, suitable weather, and the right tools. Professional help is worth considering if the surface has many cracks, failed patches, drainage issues, or areas that are breaking apart. A contractor can assess whether the job needs crack sealing, patching, sealcoating, or a combination.
Johnson Sealcoating provides asphalt maintenance for Minnesota homes and businesses, including sealcoating and crack sealing. The team can inspect the surface and explain which work appears necessary before you decide how to proceed.
Frequently Asked Questions
Can I seal a driveway that has cracks?
Cracks should be assessed and repaired before the main coating is applied. Sealcoat alone will not reliably fill working cracks or fix structural damage.
How long should I keep cars off the driveway?
Use the waiting period stated by the sealer manufacturer or your contractor. Weather and shade can affect the time needed.
Can I apply sealer over an old coat?
Sometimes, if the old coating is sound and compatible. Peeling, flaking, or built-up layers should be assessed first.
Is sealing a new driveway necessary right away?
No. New asphalt generally needs time to cure. Ask the installer when the surface is ready for its first coating.
What tools do I need for a DIY job?
Typical supplies include a broom or blower, suitable cleaner, repair materials, an applicator, protective gear, and barriers to keep traffic away.
Final Thoughts
If you are unsure whether your driveway needs a coating or repairs first, Johnson Sealcoating can help you understand the options. Call (763) 238-0963 or visit https://johnsonsealcoatingmn.com/ to request a free quote.