Weld‑Crete — Concrete Bonding Agent (Blue PVA)

Weld‑Crete is a high‑strength PVA (polyvinyl acetate) bonding agent designed to bond new concrete, stucco, or plaster to old concrete or other difficult surfaces. Contractors often call it “the blue glue for concrete.”

What Weld‑Crete Does

Creates a strong chemical bond between old and new concrete.
Prevents delamination, cracking, and separation.
Allows new cement-based materials to adhere to smooth, dense, or non‑porous surfaces.
Eliminates the need for roughening or scoring in many applications.

️ Primary Uses of Weld‑Crete

1️⃣ Bonding New Concrete to Old Concrete

Ideal for:

Sidewalk patching
Step repairs
Driveway repairs
Basement floor overlays
Concrete wall resurfacing

Prevents the new pour from popping off the old slab.

2️⃣ Bonding Stucco to Concrete or Masonry

Used when applying:

New stucco over old stucco
Stucco over block or brick
Stucco over poured concrete walls

Ensures a strong, long-lasting bond.

3️⃣ Bonding Plaster to Concrete

Useful for:

Interior wall resurfacing
Repairing plaster over concrete ceilings
Veneer plaster systems

4️⃣ Bonding Toppings, Overlays & Skim Coats

Works with:

Cement-based skim coats
Leveling compounds
Thin overlays
Patching materials

5️⃣ Bonding to Difficult Surfaces

Weld‑Crete helps cement stick to:

Smooth concrete
Precast concrete
Tilt-up panels
Dense masonry
Painted concrete (if paint is sound)

How to Apply (Simple Steps)

Clean surface (dust, oil, loose concrete removed).
Brush, roll, or spray on a thin, even coat of Weld‑Crete.
Allow it to dry tacky (usually 1 hour).
Apply new concrete/stucco while still tacky.

Key Advantages

Strong, reliable bond
Saves time — no need for mechanical roughening in many cases
Blue color makes coverage easy to see
Works indoors and outdoors
Compatible with most cement-based material

Blue Bonding Agent

LARSEN PRODUCTS CORP.

WELDCRETE 22000 CONCRETE BONDER
Bonds new concrete, stucco, tile setting beds &-
terrazzo to any structurally sound surface
Use for bonding setting beds for ceramic tile,-
bonding portland cement plaster & stucco mixes,-
& to bond to surfaces such as brick, block, tile,-
marble , metal, glass block, soundly adhered paint-
& silicone.
Polyvinyl acetate homopolymer formula
Can be painted on in a single application 1 hour-
to 10 days prior to concrete placement
Astm c-932 tensile bond strength
Astm c-78 flexural bond strength
Astm c-1042 shear bond strength
Astm c-109 temperature range
Covers approximately 200 to 300 sq. Ft. Per gallon depending on method of application, temperatures, porosity and texture of the substrate.
Blue and non-bleeding

Weld-Crete is a concrete bonding agent used to bond new concrete, stucco, terrazzo, or tile setting beds to existing structurally sound surfaces, both interior and exterior.
Here’s a detailed look at its applications and benefits:
Primary Uses of Weld-Crete
• Bonding New Concrete to Old Concrete
• Ideal for overlays, patching, and resurfacing
• Used on floors, walls, columns, beams, steps, and ramps
• Stucco and Plaster Applications
• Bonds portland cement plaster and stucco mixes to surfaces like brick, block, tile, marble, and glass block
• Tile Setting Beds and Terrazzo
• Ensures strong adhesion for ceramic tile and terrazzo installations over concrete or masonry
• Specialty Surfaces
• Can be applied to soundly adhered paint (non-water-soluble), metal, and glass block
• Used in bonding cement mortar beds to smooth concrete for rigid foam insulation or radiant heat systems
✅ Key Benefits
• High Bond Strength: Proven tensile, flexural, and shear bond strength under ASTM standards
• Extended Open Time: Allows flexibility in scheduling reinforcement and formwork placement
• Interior and Exterior Use: Versatile for a wide range of construction and repair projects
• Ready-to-Use: Water-based emulsion with easy brush or roller application
⚠️ Application Tips
• Apply to clean, structurally sound surfaces
• Avoid use over water-soluble paints like calcimine or casein
• Follow manufacturer’s guidelines for drying time and coverage (typically 200–300 sq ft per gallon)
Weld-Crete is a trusted solution for professionals needing reliable concrete bonding in demanding environments. If you’re planning a specific repair or installation, I can help you determine if Weld-Crete is the right fit.

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Best for Adhesives & Glue, Fasteners, Paint Accessories