Find out exactly how much Gravel-Lok you need for your project
Project Area (SF)
Installation Method
Results for —
Select Thickness
Tip: minimum depth should be at least 3× your stone size (e.g. ½" stones → minimum 1.5" depth).
Gravel-Lok Mix
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gallons needed
Roll Coat
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gallons (90 SF/gal)
Total in Gallons
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mix + roll coat
Gravel-Lok Coverage Guide — Mix Method
Desired Thickness
1" Thick
1.5" Thick
2" Thick
SF to be covered
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Gravel-Lok Mix (gal)
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Roll Coat (gal)
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Total in Gallons
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Minimum thickness: 2.5". Light pours of Gravel-Lok are applied directly onto dry stones.
Roll Coat
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gallons (90 SF/gal)
1 Light Pour
19 SF per gallon
Pour gallons—
Roll coat—
Total gallons—
2 Light Pours Recommended
14 SF per gallon combined
Pour gallons—
Roll coat—
Total gallons—
Gravel-Lok Coverage Guide — Pour Method
Pour Method
Gallons
Minimum Thickness
2.5"
1 light pour (gal)
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2 light pours (gal)
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Roll Coat (gal)
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Total in Gallons (2 pours + roll coat)
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💡 Tips:
Stone selection: Use washed and cleaned angular stones — angular edges interlock better for durability, and clean stones ensure proper bonding.
Minimum depth: Depth should be at least 3× your stone size (e.g. ½" stones → 1.5" minimum depth).
Light-colored stones? Use Clear formula — it contains UV additives and won't discolor your stones.
Mix ratio: Do not exceed 20–24 oz of liquid per 5-gallon bucket of stones (~50 lbs). Too much liquid causes foaming.
🌡️ Temperature: Install only when temperatures will remain between 50°F and 90°F for at least 24 hours after application to ensure proper curing.
⚠️ Installing over existing concrete? Add a roll coat to the concrete and while it is wet add the mixed Gravel-Lok with gravel to help it stick to the concrete.
Gravel-Lok: Lock Loose Stone Into a Permeable Surface
Gravel-Lok — "gravel glue" — is a polyurethane binder that bonds loose pea gravel and decorative stone into a firm surface. No more shifting gravel, ruts, or stone migrating into the lawn.
It stays porous, so water drains right through. The main planning question is simple: how much do you need? That's what the calculator on this page is for.
Because it binds stone instead of sealing it solid, a Gravel-Lok surface stays permeable: it reduces stormwater runoff, recharges groundwater, and runs cooler than asphalt. With 1/8" to 1/2" stone it's firm enough to be ADA-compliant and safe for wheelchairs and bikes, and it works with all kinds of decorative aggregate — pea and river gravel, granite, marble, even recycled glass. It's made in the USA, and it goes just about anywhere loose stone does.
01Where It Works
Pathways & Patios
A stable, low-maintenance walking surface that won't scatter underfoot.
Residential Driveways
The look of loose gravel without the ruts, washboarding, or migration.
Tree Pits & Borders
Permeable surrounds that let trees and beds breathe while staying tidy.
French Drains & Stonescaping
Decorative drainage and accents that hold their shape over time.
02Clear or Amber?
Gravel-Lok comes in two formulas, and the right one depends entirely on your stone color.
Pour on, spread, and let the binder flow into the stone.
The process is straightforward but unforgiving of shortcuts. Start with a sound base — clean, level concrete or asphalt that has fully cured (about 7 days for concrete, 28 for asphalt). Block paving and wood aren't recommended, because they crack and move underneath. With clean, dry, dust-free stone in place, pour the binder on with a watering can, spread it evenly, and trowel out any bumps. Let it dry overnight, then apply a second coat and let that cure overnight too. The one rule that breaks more installs than any other: dust-free, dry aggregate — if the stone is dirty or damp, the resin won't bond.
04How Much Do You Need?
Coverage shifts with stone size and the number of coats.
Coverage comes down to two things: the size of your stone and the number of coats. Finer aggregate has more surface area, so it soaks up more binder; larger stone needs less. Plan on two coats for a durable bond. Rather than guess, enter your square footage and stone size into the Gravel-Lok Calculator above and it estimates the gallons you'll need — then round up so you're not stopping mid-pour. Gravel-Lok ships in a 1-gallon trial size, 5-gallon pails, and 50-gallon drums for large jobs.
05Test the Ratio First
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Before you commit to the whole area, dial in the binder-to-stone ratio on a test patch: apply about 20 oz of binder to 5 gallons of stone over a small surface and wait 15 minutes. If the base beneath the stone is wet, your ratio is right; if it's still dry, add a couple more ounces and retest. A 10-minute check now saves a saturated, slow-curing mess later.
06Quick Planning Checklist
1
Pick the formula: Clear keeps light stone its natural color; Amber is warmer and cheaper — never Amber on white stone
2
Check the base: clean, level, fully cured concrete or asphalt — not block paving or wood
3
Size the job: finer stone and two coats need more binder — use the calculator and round up
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Mind the weather: dry, dust-free stone and no rain within 24 hours; cover it if needed
5
Test the ratio on a small patch before doing the whole surface
Gravel-Lok comes in Clear and Amber, in 1-gallon, 5-gallon, and 50-gallon sizes: the Clear 5-Gallon and Amber 5-Gallon cover most residential projects, the 1-gallon trial is perfect for a test patch, and 50-gallon drums handle large or commercial work — all made in the USA with free shipping.
Ready to Price Out Your Project?
Use the Gravel-Lok Calculator above — enter your area and stone size, and it tells you how much binder to order.
