Coal tar sealer cost

Coal tar sealer costs $0.15 to $0.30 per square foot installed and $0.05 to $0.12 per square foot in materials for a DIY job. A 1,000 square foot driveway therefore runs $150 to $300 from a contractor, or $50 to $120 if you buy the pails and apply them yourself. Crack filling and patching sit on top of those figures and often rival the sealer line.

What the rate covers

Coal tar sealer is a refined coal-tar emulsion blended with water, clay filler, and sometimes polymer, applied in two coats to darken and protect an asphalt surface.

The installed rate covers cleaning, a primer or tack coat where the contractor considers it necessary, two applications, and barricades. It does not usually cover crack filling, pothole patching, or oil-spot priming, which is why a quote can look low on the phone and higher on paper.

Cost by driveway size

The arithmetic is straightforward: square footage multiplied by the rate band. Both columns assume two coats.

Worked out for the mid-size case: 1,000 × $0.05 = $50 and 1,000 × $0.12 = $120 in material. The same area installed is 1,000 × $0.15 = $150 and 1,000 × $0.30 = $300. At 2,500 square feet the numbers are 2,500 × $0.05 = $125 to 2,500 × $0.12 = $300 for DIY, and 2,500 × $0.15 = $375 to 2,500 × $0.30 = $750 installed.

Large drives trend toward the lower end of the installed band because setup and travel are spread over more area. Small drives trend high, and many contractors apply a minimum job charge that effectively pushes a 400 square foot apron toward the top of the range.

The extras that change the total

Sealer is rarely the only line on the invoice. The other three items are predictable.

• Crack filling at $2 to $5 per linear foot. Sixty linear feet is $120 to $300 (60 × $2 = $120; 60 × $5 = $300).
• Pothole patching at $100 to $400 each, depending on depth and whether the base needs excavation.
• Oil spot priming, usually a small flat charge or included, and worth confirming because a spot left unprimed bleeds through the new coat.

A realistic 1,000 square foot job with sixty feet of cracks and one pothole lands between $370 and $1,000 installed ($150 + $120 + $100 = $370 at the low end; $300 + $300 + $400 = $1,000 at the high end). That is the number to budget, not the sealer rate alone.

One coat or two

Two coats at the label rate is the standard, and the second coat is where the visible difference sits. On a 1,000 square foot drive, a single coat uses roughly half the material, so a one-coat job saves about $25 to $60 in DIY material or brings an installed quote down by a similar margin before labour.

The saving is usually a false economy on a weathered surface, because a single thin film greys out faster and gives up a year of service life. On a driveway that was sealed last season and only needs refreshing, one coat is defensible.

Coal tar vs asphalt emulsion on price: both fall in the same $0.15 to $0.30 installed band. Coal tar quotes tend to come in at the higher end where it remains legal, because it is applied heavier and the contractor pool is smaller. Emulsion quotes sit lower but carry a shorter recoat interval, which you can see laid out in coal tar sealer vs asphalt emulsion sealer.

When sealing is the wrong purchase

A $300 coat on a failing base is money spent one level too high. If the pavement has alligator cracking, depressions, or edge crumbling, the surface film will not hold, and the next quote you need is structural.

An asphalt overlay at $3 to $7 per square foot is $3,000 to $7,000 on 1,000 square feet. Full replacement at $8 to $15 per square foot is $8,000 to $15,000. Those figures are an order of magnitude above sealing, which is exactly why sealing on a sound surface is worth doing — and why sealing a failing one is not. Driveway sealing repair covers the middle ground where patching is still viable.

You can also sanity-check the annual cost. A $300 installed job lasting four years is $75 per year; the same job lasting two years is $150 per year. The recoat interval matters as much as the quote.

Getting comparable quotes

1. Ask for the square footage the contractor measured, not the driveway description.
2. Ask how many coats and at what coverage rate per gallon.
3. Ask whether crack filling and patching are included, and at what rate per linear foot.
4. Confirm the product — coal tar or asphalt emulsion — and whether local rules restrict one of them.
5. Get three quotes on the same scope before comparing totals.

A quote that omits crack filling is not cheaper; it is a different job. Line-item comparisons are the only ones that mean anything. How much does driveway sealing cost has the wider market picture if you want to check a quote against typical ranges.