By Samuel Wisowaty, Perma-Patch. Updated November 13, 2026.
Alligator cracks are a fatigue failure, not a surface blemish. If the pieces are still tight and the area has not sunk, you can lock the section together with a mastic like Gator-Aid®, squeegeed on in lifts no thicker than 1/4 inch at 50°F or above. If the pieces rock under your boot, the base has failed and the section needs a dig-out and a patch. Here is how to tell the difference and do the work.
What Alligator Cracking Is
Walk any lot that is fifteen years old and you will find it: a patch of pavement, usually in the wheel path or where trucks turn, broken into a web of small plates that look like reptile skin. Crews call it alligator cracking, gator cracks, or fatigue cracking. The federal Long-Term Pavement Performance (LTPP) Distress Identification Manual describes it as a series of interconnected cracks in areas that take repeated traffic loads, which develop into many-sided, sharp-angled pieces, usually less than about a foot on the longest side.
The word that matters there is fatigue. The surface did not crack because it got old. It cracked because it flexed under load more times than the mat could take, usually because the base under it got soft. Water is almost always in the story: it gets into the first cracks, sits in the base, and every freeze and every axle widens the web.
That is why alligator cracking is the step before a pothole. The crack you ignore in November is the pothole you patch in April.
Patch It or Dig It Out: The Decision
This is the question every maintenance manager is actually asking, so answer it before you open a pail. Get down and press on the plates with your boot heel, then look at the whole area.
Treat it with a mastic if: the pieces are tight and do not move; the surface is at grade or close to it; there is no fine material or water pumping up out of the cracks after rain; the area is a lot, driveway, court, walkway, or low-speed street.
Dig it out if: the pieces rock, lift, or have already come out; the area has sunk into a depression that holds water and the cracking goes to the bottom of it; the base pumps mud when a tire rolls over it; it sits in a heavy truck lane. A mastic will not fix a failed base. It will fill the cracks and the base will keep moving under it.
The honest middle ground is the dish, or bird bath, that holds water but whose plates are still tight. Those can be filled in lifts and are listed on the Gator-Aid info sheet.
For the dig-out, saw-cut the perimeter, take out the failed material down to a sound base, compact the base, and fill with a cold patch such as Perma-Patch® Regular Mix, placed in 3-inch lifts and compacted. That is a different job, covered in the pothole repair guide; the rest of this page is about the first case.
Why a Mastic and Not Crack Filler or Sealcoat
The objection, from the person who has tried both: “I poured crack filler in it and it was back in a year.” It was always going to be. A pourable crack sealant like 6690 ColdFuze is built for a linear crack with two walls. An alligatored area is hundreds of short cracks with no walls and a surface that is raveling between them. You cannot pour your way through it.
Sealcoat alone fails the other way. It is a surface film a few mils thick. It hides the web for a season and the plates keep flexing underneath.
A mastic sits between those two. Gator-Aid is a blend of asphaltic emulsion, mineral fillers, recycled shingles, ground rubber and plasticizers, thick enough to be worked into the cracks with a flat-blade squeegee and to leave a skin across the plates that ties them together. The info sheet positions it as the lower-cost alternative to a hot-mix skin patch, which requires digging out and replacing the area. Its water-resistance test (ASTM D2939) result is no blistering and no re-emulsification. It is for alligatored and raveled areas and for individual cracks wider than 1 inch. For cracks under an inch that are not alligatored, use the crack sealants, not this.
What You Need
- Gator-Aid® 5 gallon pail (PP-CF-GATOR5). One pail covers up to 20 square feet of alligatored area at 1/4 inch depth, or up to 80 linear feet of 1/2 x 1/2 inch cracks.
- Flat-blade neoprene squeegee for the alligatored area. V-shaped rubber squeegee for scraping excess off individual cracks.
- Stiff broom, blower or compressed air, and a wire brush for the loose stuff.
- A paddle or drill mixer. The pail gets mixed before every use.
- Water for cleanup while it is wet. Paint thinner if it has dried on a tool.
- A thermometer you trust. The floor is 50°F.
How to Repair Alligatored Asphalt, Step by Step
- Check the weather first. Surface temperature 50°F or above, rising is better. No rain in the forecast. If the surface is wet, come back. Do not store the pail where it will freeze or where it gets above 100°F in a truck bed.
- Measure and order. Pace off the alligatored area in square feet and divide by 20 for pails at a single 1/4 inch lift. Severe areas take a second lift, so a 100-square-foot section that needs two coats is ten pails, not five. Add the linear feet of any wide cracks at 80 feet per pail. Round up.
- Clean it. The surface must be dry and free of all loose material, dirt and dust. Wire-brush the raveled plates, blow out the cracks, sweep the whole area past the edge of the damage. Anything loose under the mastic becomes a void. This is the step that gets skipped and the step that decides whether the repair holds.
- Mix. Mix the pail well before using. Use it as is, no thinning, no additives.
- Pour and squeegee. Pour onto the alligatored area and work it in with the flat-blade squeegee, pushing the material down into the cracks and then pulling a skin across the plates. Apply no thicker than 1/4 inch in one pass. Feather the edge past the last crack so there is no lip for a plow or a tire to catch. For individual cracks wider than 1 inch, fill them and scrape the excess off the surface with the V-shaped rubber squeegee before the material sets. For a bird bath, fill in lifts of 1/4 inch maximum and let each lift harden before the next.
- Let it set. Gator-Aid sets in several hours, depending on weather and how thick it went on. Keep traffic off until it has hardened. Severe areas may need a second application once the first has set. Wash the squeegee and mixer in water before it dries.
- Sealcoat later, not sooner. If the lot is due for a seal, let the Gator-Aid harden fully first. Then a sealcoat like Black Elixir goes over the whole surface and the repair disappears into it. Do not seal over soft mastic.
How Long It Lasts
Nobody can give you a year count without seeing the base. What the repair does is stop water getting into the web and stop the plates raveling at the edges, which is what turns a tight gator into a loose one and a loose one into a pothole. Treat it in spring or fall, when the surface is 50°F and the forecast is dry, and you buy time on the pavement’s schedule instead of the budget’s. The dig-out still happens someday. The point is choosing which year.
When This Is the Wrong Product
- A pothole, or plates already missing. Cold patch, not mastic. See Regular Mix.
- A clean linear crack under 1 inch wide. Crack sealant, not mastic. See the crack sealers.
- A base that pumps or a truck lane that has failed. Contractor, saw-cut, full-depth repair.
- Concrete. Gator-Aid is for asphaltic surfaces.
- Any day under 50°F, any wet surface, any rain forecast.
Questions Crews Ask
Can I drive on it the same day?
It sets in several hours depending on temperature and thickness. Keep vehicles off until it has hardened. Cooler weather and a thicker lift mean longer.
Do I have to fill every crack first?
No. For an alligatored area the mastic is squeegeed across the whole section and worked into the cracks in the same pass. Individual cracks wider than 1 inch outside the area get filled and scraped separately.
Can I apply it over old sealcoat?
The info sheet asks for a dry surface free of loose material, dirt and dust. Old sealcoat that is tight and clean meets that. Old sealcoat that is flaking does not; wire-brush it off first.
How many pails for a driveway?
Measure the alligatored area, not the driveway. A 10 by 12 foot section at one 1/4 inch lift is 120 square feet, six pails, more if it needs a second lift. Run the same math for a lot.
What is the shelf life?
One year in the original unopened container. Keep it closed between uses, out of direct sun, and never where it will freeze.
Try It on Your Worst Section
If your last gator repair was back in a year, send us the measurements of the one that bothers you most. We will send a sample, and a rep who has done this on a live lot will tell you whether it is a mastic job or a dig-out.
