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Retaining Wall Adhesives
SRW Solvent-Based & Rapid-Set
Retaining Wall Adhesives
Set The Caps. Once.
Professional-grade construction adhesive for locking caps, copings and coursing in place — two formulas, one for extreme cold and one for a same-day cure.
- Two formulas, 10 oz & 28 oz
- Full 12-tube contractor cartons
- Free shipping · (800) 524-4161
- 2Formulas stocked
- 89ftPer 28 oz tube
- 12Tubes per carton
- 10°FStill extrudes
Choose Your Formula
Retaining Wall Adhesive For Caps, Copings And Coursing
Retaining wall adhesive is a high-strength construction adhesive that bonds the parts of a segmental wall gravity alone will not hold. Cap units and copings sit above the pinned, interlocked block with nothing but their own weight keeping them down, and that is not enough against a freeze-thaw cycle, a lawn mower, or somebody sitting on the wall. Landscape Discount stocks both SRW professional-grade formulas — Superior Strength Solvent-Based for cold and damp conditions, and Rapid-Set Polyurethane for fast cures and non-porous materials — each in 10 oz and 28 oz tubes, twelve tubes to a carton.
Every order ships free. Not sure which one your project needs? The comparison below covers temperature range, cure time and coverage, and the FAQ answers the most common application questions.
Original price
$176.48
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Original price
$176.48
Original price
$176.48
$176.48
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$176.48
Current price
$176.48
Retaining Wall Adhesive - (12) 10oz Tubes - Superior Strength Solvent Based - SRW
Retaining Wall Adhesive · Superior Strength Solvent-Based · (12) 10 oz Tubes A carton of twelve 10 oz tubes of SRW Superior Strength...
View full details
Original price
$176.48
-
Original price
$176.48
Original price
$176.48
$176.48
-
$176.48
Current price
$176.48
Original price
$190.53
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Original price
$190.53
Original price
$190.53
$190.53
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$190.53
Current price
$190.53
Retaining Wall Adhesive - (12) 10oz Tubes - Rapid Set Polyurethane - SRW
Retaining Wall Adhesive · Rapid-Set Polyurethane · (12) 10 oz Tubes A carton of twelve 10 oz tubes of SRW Rapid-Set Polyurethane ret...
View full details
Original price
$190.53
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Original price
$190.53
Original price
$190.53
$190.53
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$190.53
Current price
$190.53
Original price
$271.02
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Original price
$271.02
Original price
$271.02
$271.02
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$271.02
Current price
$271.02
Retaining Wall Adhesive - (12) 28oz Tubes - Superior Strength Solvent Based - SRW
Retaining Wall Adhesive · Superior Strength Solvent-Based · (12) 28 oz Tubes A carton of twelve 28 oz tubes of SRW Superior Strength...
View full details
Original price
$271.02
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Original price
$271.02
Original price
$271.02
$271.02
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$271.02
Current price
$271.02
Original price
$274.97
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Original price
$274.97
Original price
$274.97
$274.97
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$274.97
Current price
$274.97
Retaining Wall Adhesive - (12) 28oz Tubes - Rapid Set Polyurethane - SRW
Retaining Wall Adhesive · Rapid-Set Polyurethane · (12) 28 oz Tubes A carton of twelve 28 oz tubes of SRW Rapid-Set Polyurethane ret...
View full details
Original price
$274.97
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Original price
$274.97
Original price
$274.97
$274.97
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$274.97
Current price
$274.97
Buyer's Guide
How Retaining Wall Adhesive Works
A retaining wall adhesive is a high-strength elastomeric construction adhesive run as a bead along a course to bond units that nothing else is holding. It is not mortar and it is not a substitute for one. A segmental wall is designed to be dry-stacked and slightly flexible so it can settle with the soil behind it without cracking; adhesive preserves that flexibility while locking the pieces that need locking — caps, copings, seat wall units, firepit rings, cut pieces at a corner. Because it stays elastic rather than going brittle, it survives the freeze-thaw movement that shears a rigid bond apart.
Two formulas cover almost every project. Superior Strength Solvent-Based is the original VOC formula, and it is the one that keeps working when conditions turn — it extrudes down to 10°F and bonds on wet or frozen surfaces. Rapid-Set Polyurethane reaches a firm set in 60–90 minutes and bonds non-porous substrates that defeat conventional landscape adhesives. Both come in 10 oz and 28 oz tubes, twelve tubes to a carton.
Solvent-Based Vs Rapid-Set Polyurethane
Cold weather
Superior Strength Solvent-Based
The original VOC formula, proven over 35 years as the strongest adhesive of its kind. Application range runs 10°F to 120°F, it bonds damp or frozen surfaces, and it will not freeze in the tube. Full cure takes 3–7 days, and flashing the unit shortens it.
- Extrudes down to 10°F
- Bonds wet or frozen surfaces
- 10 minute working time
- 18 month shelf life
Fast cure
Rapid-Set Polyurethane
The fastest-curing formula in the line — firm set in 60–90 minutes and full cure in 24–48 hours, so the wall carries load the same day. Bonds non-porous substrates including metals, foam and clay, and its high-temperature tolerance suits firepits and outdoor kitchens.
- 60–90 minute firm set
- Bonds non-porous materials
- Dry or damp surfaces
- VOC-compliant in all 50 states
| Spec | Solvent-Based | Rapid-Set Polyurethane |
|---|---|---|
| Working time | 10 minutes | 15 minutes |
| Firm set | Flash to accelerate | 60–90 minutes |
| Full cure | 3–7 days | 24–48 hours |
| Temperature range | 10°F – 120°F | 45°F – 90°F for easiest extrusion |
| Surface condition | Dry, wet or frozen | Dry or damp |
| Shelf life | 18 months, will not freeze | 12 months, store cool and dry |
| Coverage, 1/4″ bead | 32 ft (10 oz) · 89 ft (28 oz) | 32 ft (10 oz) · 89 ft (28 oz) |
Common Applications
Wall caps & copingsThe volume application — the top course has nothing but its own weight holding it.
Seat wallsCaps that people sit and stand on need a permanent bond, not friction.
Firepits & outdoor kitchensRapid-Set is the high-temperature formula — never in contact with flame or fire brick.
Steps & treadsBonds treads to risers where a mortar joint would crack out.
Pillar & column capsExposed on all four sides, so the bond carries the whole unit.
Cut pieces at cornersCut units lose their pin or lip engagement and need bonding back in.
How Much Adhesive Do I Need?
Coverage is quoted in linear feet of bead rather than square feet, because adhesive runs in a line along the course instead of covering the face of the unit. Measure the length of wall you are capping, then adjust for the bead pattern — two parallel beads on a wide cap doubles the figure. Both formulas cover identically.
| Bead size | 10 oz tube | 28 oz tube |
|---|---|---|
| 1/4″ bead | 32 feet | 89 feet |
| 3/8″ bead | 14 feet | 35 feet |
- Use the 3/8″ bead on tumbled units. A weathered surface is irregular, and the wider bead is what makes full contact across it — at less than half the coverage.
- Buy the full carton. Cartons ship free and adhesive keeps a year or more sealed. Running short mid-course leaves an unbonded cap overnight.
- A full positive connection matters more than volume. Adhesive touching only one of the two surfaces is not holding anything, however much went down.
How To Apply Retaining Wall Adhesive
The sequence is the same for both formulas; only the set step differs. Surface prep does more for the bond than the amount of adhesive you put down.
- 1Clean both surfaces
Surfaces must be free of oil, grease, dust, excessive water and ice. On metal, take off scale and rust to a bright surface; on masonry, expose sound material free of laitance; on wood, scrape paint back to bare timber.
- 2Cut the tip and load the gun
Cut the nozzle on a slant for a 1/4″ to 3/8″ bead, puncture the inner seal with a nail or wire, and seat the tube in a cartridge gun.
- 3Run a continuous bead
Apply to one of the two surfaces in an unbroken line. Do not put down more than you can cover inside the working time — 10 minutes for solvent-based, 15 for Rapid-Set.
- 4Set the unit
Press firmly. With Rapid-Set, add a slight twisting motion. With solvent-based, lift the cap for a second or two and set it straight back — flashing shortens the cure noticeably.
- 5Support anything vertical
Vertical applications need permanent horizontal support. Above 90°F, brace Rapid-Set work for 24 hours while it cures.
Not for every material
Shop adhesives
Skip both formulas on plastic, rubber and fiberglass, anywhere under continuous submersion or below the waterline, and in direct contact with flames or fire brick. Wear gloves with Rapid-Set — once cured it cannot be removed.
Building The Rest Of The Wall
Retaining wall geogridWalls over about 3 to 4 feet, or anything holding clay or a surcharge, need tensile reinforcement between courses.
Retaining wall fabricGeotextile behind the wall keeping fines out of the drainage stone. Poor drainage is the leading cause of wall failure.
Fence post anchoringPutting a fence on top of the wall? A pre-engineered sleeve anchors the posts in the soil mass behind it.
Retaining Wall Adhesive FAQs
Which formula should I buy?
Solvent-based if you are working in the cold or on surfaces that are damp or frozen — it extrudes down to 10°F, where polyurethane becomes hard to push below 60°F. Rapid-Set Polyurethane if you need the job holding load the same day, or if you are bonding non-porous materials like metal or foam. For a straightforward cap job in mild weather, either works.
How much does one tube cover?
At a 1/4″ bead, a 10 oz tube runs 32 linear feet and a 28 oz tube runs 89 feet. At a 3/8″ bead — the recommendation for tumbled units — a 10 oz tube covers 14 feet and a 28 oz tube covers 35 feet. The figures are the same for either formula.
Can I use regular construction adhesive instead?
Hardware-store adhesive is generally formulated for indoor work and goes brittle outdoors, where freeze-thaw movement and UV exposure break the bond within a few seasons. These formulas are made for exterior hardscape service and stay elastic, which is what lets a dry-stacked wall move slightly without popping its caps off.
Is adhesive a substitute for mortar?
No, and it is not meant to be. A segmental wall is designed to be dry-stacked so it can flex as the soil behind it settles. Adhesive bonds the pieces gravity will not hold — caps, copings, seat wall units, cut corners — while leaving the wall its flexibility. Mortaring a segmental wall solid works against the design.
Do I need adhesive on every course?
No. The body of the wall is held by the weight of the block, the pin or lip system, and the reinforced soil behind it. Adhesive goes where there is nothing else doing that job — the top course, copings, cut pieces, and any unit that is not interlocked.
How do I make it set up faster?
With the solvent-based formula, flash it: after pressing the cap down, lift it for a second or two and set it straight back. On the polyurethane, a light mist of water during application speeds curing on non-porous materials. Full cure is 3 to 7 days for solvent-based and 24 to 48 hours for Rapid-Set.
Will it work in freezing weather?
The solvent-based formula will — it extrudes down to 10°F, bonds on wet or frozen surfaces, and will not freeze in storage. That is the reason it stays in the lineup alongside the faster polyurethane.
How do I clean it up?
Mineral spirits, while the adhesive is still wet, on either formula — follow the solvent vendor's precautions. Once cured, neither can be removed, so wipe squeeze-out off a finished face before it sets rather than after.
How much does shipping cost?
Shipping is free on every order at Landscape Discount — both formulas and both tube sizes ship free, with no minimum.