Start by looking at the pavement around the crack. If it is firm and the opening is isolated, a suitable filler can help keep water and debris out. If the driveway is sinking or breaking into a network of pieces, have the pavement and its support assessed before spending money filling individual lines. Once you know which job you have, match the product to the opening and follow its preparation and curing instructions.
Decide what you are repairing
Walk the driveway in daylight and mark the cracks you intend to treat. An isolated, stable crack in otherwise firm pavement is a reasonable place to start with a packaged filler. Look for nearby potholes, sinking edges, a soft spot under a tire or a web of interlocking cracks. Those signs change the job. The Asphalt Paving Handbook[1] says badly cracked areas, particularly map or alligator patterns, should be patched or replaced. Filling each line in the pattern does not restore the failed area beneath it.
Measure the widest part of each crack and note whether its edges are solid. Use that measurement to narrow the product choice, then check the surrounding pavement before deciding the repair is suitable. A Black Jack Speed-Fill Elastic Crack Filler, for example, is rated by its maker[2] for joints up to three-quarters of an inch wide. Rust-Oleum's RockSolid Asphalt Patch instructions[3] limit its crack-filling use to cracks up to half an inch wide. Those ratings describe where each product can be applied. A crack within the listed width still needs sound surrounding pavement; if the section is breaking apart or moving, have a paving contractor assess it before buying filler.
For more than one crack, make a quick sketch with each length and widest opening. Photograph the broken edges before sweeping them clean, especially if you may request a repair quote. That record lets you buy for the actual openings and describe the damaged area clearly; it also gives you something concrete to compare with the pavement after a season of weather and traffic. Keep an eye on the surrounding surface, not only the filler line.
Choose the material by its instructions
At a home center, “crack filler,” “patch,” and “driveway sealer” may sit on the same shelf. Read the intended use before buying. A surface sealer is not a substitute for repairing a larger crack or hole: Black Jack's driveway guidance[4] tells readers to repair those defects before sealing. Some products do both patching and crack filling. RockSolid Asphalt Patch, for example, mixes a dry material with water and uses different directions for holes and cracks. Its directions are not interchangeable with those for a ready-to-pour elastic filler.
For a single, accessible crack, choose a consumer product rated for the measured width and the weather you expect during application. Check whether it calls for a dry surface, a particular temperature range, a depth limit, a second application or a waiting period before vehicles return. Use the package's yield guidance with your sketch of the cracks to estimate how much to buy. Check that estimate against the different widths and depths you measured, especially where an opening changes along its length.
Keep this do-it-yourself repair to packaged homeowner products applied without specialized heating equipment. Black Jack's Speed-Fill technical sheet[5] expressly says not to heat that product. If another repair system calls for heating or routing, have a paving contractor explain the work before choosing it; a household pot or propane torch should not become an improvised application system.
Prepare a sound, clean crack
Good preparation is mostly patient cleaning. Remove weeds and loose pieces with a hand tool or stiff brush. Sweep or blow out dust and grit. Keep loose material from collecting on the surrounding driveway while you work. Rust-Oleum's surface-preparation directions[3] call for removing dirt, rock, oil and other contamination and letting the driveway dry fully before patching. A screwdriver or wire brush is listed for cleaning cracks. Do not leave a layer of loose grit where the filler needs to bond.
If the product directions allow washing, use it to remove oily residue or dirt and leave enough time for the opening to dry. Rust-Oleum describes pressure washing to remove degreaser, followed by full drying. Check the bottom and sides of the crack against the label's required surface condition rather than working to a fixed clock. Keep a propane torch out of the preparation: open flame near the garage, fuel or vegetation introduces a hazard and gives you no assurance that the crack meets those instructions.
Check the filler's opening and preparation requirements before widening a crack. The Asphalt Paving Handbook describes mechanical routing for some narrow cracks in professional pavement preparation, where the unprepared opening may not accept sealant. That work needs an appropriate repair system and equipment. If your chosen homeowner product cannot enter the opening or its edges keep crumbling, choose a suitable product or ask a paving contractor to assess the preparation.
Apply the chosen filler, then protect it
Read the container once before opening it and once again before traffic returns. Check the specified air and surface temperatures, rain window, mixing method, maximum crack width and depth, and finish level. Work in manageable lengths so you can place material where it belongs rather than spreading it across sound pavement. Wear the protection listed on the package.
For one concrete example, the RockSolid Asphalt Patch sheet directs users to mix its powder with water, place the mixture in cracks no more than half an inch wide, wipe excess from the surface and avoid overfilling. It limits a single application to one inch deep. Keep those measurements with the RockSolid instructions. When using an elastic filler instead, check its nozzle, depth and finish requirements before filling the opening, and use a backer material only if that product explicitly permits it.
The Asphalt Paving Handbook[1] advises keeping crack material slightly below the surrounding pavement in its overlay-preparation guidance so excess does not create a bump under the next layer. For an exposed residential repair, let the specific product's finish instructions decide the level. Speed-Fill, for example, calls for filling slightly higher to allow for settling. Follow that product's directions when placing and cleaning up the material, then check the finished repair before allowing traffic back.
Keep people, bikes and vehicles off the repair for the time on that product's label, accounting for cool or damp conditions. RockSolid says normal traffic can return in one to two hours under its stated conditions and warns that colder weather lengthens drying. Keep that traffic interval with the RockSolid example and check the label of the product you actually used before reopening the driveway. A dry-looking top alone does not establish readiness. If a later sealcoat is planned, read both the filler and sealer instructions for compatibility and recoat timing so the next job fits the repair beneath it.
Know when filling is no longer enough
After the repair, watch whether the same line reopens or the pavement around it starts to settle. A single failed application may reflect poor cleaning, weather or product mismatch. If it keeps reopening and the surrounding pavement is sinking or fracturing, have that section assessed before refilling it. The Asphalt Paving Handbook recommends patching or replacing badly cracked pattern areas. A contractor can assess whether a local patch, drainage work or a larger replacement makes sense for this driveway.
Before paying for a larger repair, get a quote tied to the damaged area, preparation and material the contractor proposes. Ask who will check local requirements and handle any permit the proposed work needs before it begins. For a small crack you fill yourself, keep the product label and your photos so you can check how the opening and surrounding pavement fare through the next season. If the same section keeps moving or breaking down, take that record to a contractor and have the support and drainage investigated.
