How to Apply Concrete Bonding Adhesive | Get Patches To Stick

Nothing is more frustrating than watching a freshly poured patch pop loose from the driveway a few weeks later. The fix for a repair that won’t stick is often simpler than the repair itself. Concrete bonding adhesive, like QUIKRETE’s No. 9902, is the key to getting new concrete to grab onto old concrete, saving you a redo and the cost of a full replacement.

Whether you’re patching a cracked stoop or topping a garage floor, the application method is nearly identical. The single biggest mistake is letting the adhesive dry out before the new material goes down. Here’s the step order that works, straight from the manufacturer’s own documentation.

Before You Start: The Surface Has to Be Sound

Bonding adhesive is not a crutch for a crumbling substrate. QUIKRETE requires a surface that is clean, sound, and free of loose material. If the old concrete is dirty, oily, greasy, or flaking, the adhesive has nothing to grip, and your patch will fail no matter how carefully you apply it.

Spend the time on prep:

• Remove all dirt, oil, grease, and curing compounds.
• Chisel or grind away any loose, chipping, or unsound concrete until you reach a solid base.
• The surface can be dry or damp when you apply the adhesive — QUIKRETE allows both.

If you can scrape material off with a screwdriver, the substrate isn’t ready for adhesive yet.

The Two Ways To Apply It: Paint Coat vs. Slurry

You have two reliable options, and the right one depends on the thickness of your repair. Both methods come from QUIKRETE’s official spec guide.

Method 1: The Paint-On Coat (For Most Repairs)

This is the standard route for flat patches and toppings. Use a brush, roller, or sprayer to apply the bonding adhesive straight from the container at the thickness of a coat of paint — thin, even, and complete. Do not leave puddles or misses.

Once the adhesive is applied, wait for it to become dry to the touch.

Method 2: The Slurry Coat (For Stucco and Thin Repairs)

For stucco or thin patches where a paint coat won’t provide enough grip, QUIKRETE recommends mixing a slurry. Combine approximately 2 parts cement with 1 part Concrete Bonding Adhesive to form a creamy mixture. Apply it thinly with a trowel, brush, or squeegee, and work it firmly into the substrate.

The critical difference: with a slurry, you place the repair material immediately, while the slurry is still wet. Do not wait for it to dry. Once the slurry dries out, the bond is broken.

Did It Work? The Success Markers

Knowing your repair is going to hold comes down to timing. Watch for these signs:

• The adhesive coat is uniformly glossy when wet, then turns dull as it dries — that dull, tacky state is your signal to pour.
• The slurry coat stays wet and creamy while you apply the topping over it.
• The fresh material is pressed firmly into the bond coat, eliminating air pockets at the interface.

For thicker patches over 1 inch (25.4 mm), QUIKRETE’s quick-setting cement literature notes that bonding adhesive further enhances the grip between the layers.

If you’re weighing which product to buy for a specific repair — or want to compare top-rated options side by side — our tested roundup of the best concrete-to-concrete adhesive products breaks down what works where.

FAQs

Do I need to wet the old concrete before applying bonding adhesive?

No, but QUIKRETE allows it. The bonding adhesive can be applied to either a dry or damp surface, so a light dampening is fine if it helps control dust. What matters is that the surface is clean and sound. Avoid standing water, which will dilute the adhesive and weaken the bond.

Can I use concrete bonding adhesive as a sealer?

No, and doing so will create a problem. Bonding adhesive is designed to be covered with fresh material while it is still tacky or wet. If you let it fully cure and harden, it forms a slick film, and nothing will bond to it. Use a concrete sealer for protection, not a bonding agent.

How long does the adhesive stay tacky after application?

There’s no universal clock — it depends on temperature, humidity, and surface porosity. On a warm, dry day, the window may be short, so mix and stage your repair material before you brush on the adhesive.