Sealcoating · Residential
Oil Spot Priming and Stain Repair
If you have ever seen a sealed driveway with a peeled patch shaped exactly like the spot where a car parks, you have seen untreated oil. Sealer bonds to asphalt. It does not bond to petroleum, and an oil stain is not a cosmetic problem, it is a chemical one.
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Motor oil, transmission fluid, diesel and gasoline all attack asphalt binder directly. They soften it, break it down, and eventually leave a spongy area that fails long before the rest of the surface. A stain that has been there for years has usually gone deeper than it looks.
Surface stains get degreased and then primed with an oil spot primer that gives the sealer something to grip. Where the petroleum has softened the asphalt itself, priming is not enough and the affected area is cut out and patched before any sealing happens. We will tell you which of those you have, because sealing over softened asphalt buys you one season.
Oil damage is chemical, not cosmetic
Motor oil, transmission fluid, diesel and gasoline attack asphalt binder directly. They soften it, break it down, and leave an area that fails long before the surface around it. A stain that has been sitting for years has usually penetrated further than it appears from above.
The practical test is underfoot. A surface stain is discoloured but still firm. Where the binder has been compromised the area feels slightly spongy and may deform under a thumbnail. Those are two different repairs and treating the second like the first buys you a season.
Why sealer peels off untreated spots
Sealer bonds to asphalt. It does not bond to petroleum. Applied over an untreated oil spot it forms a film that has nothing to grip, and within the first year it lifts away in a patch shaped exactly like the stain, which looks considerably worse than the stain did.
Surface stains are degreased and then primed with a product that gives the sealer something to key into. Where the asphalt itself has softened, priming is not enough and the section is cut out and patched before sealing. Worth fixing the leak at the same time, or the new patch goes the way of the old one.
How Massachusetts conditions drive the specification
Massachusetts sets frost depth at 48 inches. A driveway has no footings, so nothing physically reaches four feet, but the frozen zone does, and anything frost can lift it will lift. That makes the base and its drainage the whole structural argument on residential work in this state.
Hot mix here is produced to the MassDOT Standard Specifications, Section 460, using Superpave designs graded by nominal maximum aggregate size. A residential surface course is normally a 12.5 mm mix; a binder course underneath is typically 19.0 mm. Dense graded asphalt needs a compacted lift at least three times the nominal maximum aggregate size, so 12.5 mm wants roughly an inch and a half minimum and 19.0 mm wants nearer three. A coarse mix laid too thin cannot lock its stone together and ravels from the first winter.
Compaction is where the money goes and nobody can see it
Hot mix leaves the plant around 275 to 300 degrees and stops accepting compaction near 185. Everything a roller will ever achieve has to happen inside that window, which shrinks fast on a cool day, on a thin lift, or with wind across the site. Target density on a properly rolled mat sits in the low to mid nineties as a percentage of theoretical maximum.
A few percentage points below that and the mat is permeable. Water then lives inside the asphalt rather than on top of it, and every freeze-thaw cycle works from within. This is why two driveways that look identical on the day of paving can be ten years apart in service life, and why laydown temperature and roller pattern matter more than the brochure the material came with.
Dig Safe, permits and paperwork
M.G.L. c. 82 s. 40 requires Dig Safe notification at least 72 hours before excavation so utilities can mark their lines. It is free and we file it. What it does not cover is private underground work on your own property: septic tanks and leach fields, wells, irrigation, invisible fencing, propane lines and power runs to outbuildings. Tell us where those are, because heavy equipment over a leach field is an expensive mistake Dig Safe will not catch.
Massachusetts also requires a written contract for residential work over $1,000 under M.G.L. c. 142A, and registration under that law gives you access to the state Guaranty Fund. Ask any contractor for their HIC number before paying anything.
What is included
Scope of work
- Assessment of stain depth and asphalt condition
- Degreasing and surface cleaning
- Oil spot primer application
- Cut out and patch where binder is compromised
- Full sealcoat over the repaired area
Related work
Often paired with
Related sealcoating services
Common questions
Before you book
Will sealcoating cover my oil stains?
Not on its own, and it will make things look worse if the spots are untreated. Sealer will not adhere to petroleum, so it lifts away in patches shaped like the stains, usually within the first year. Priming those areas first is a small step that makes the difference between a driveway that looks even and one that looks blotched.
Can a bad oil stain be repaired permanently?
Yes, if it is caught before it goes too deep. If the petroleum has only stained the surface, degreasing and priming handles it. If it has softened the asphalt so the area feels spongy underfoot, that section is cut out and patched. Fixing the leak is worth doing at the same time, or the new patch goes the same way.
Where we do this work