SURFACE APPLIED Cement Bonding Agents

Master Protect P 110/Thorobond

MasterProtect P 110

A water-based polyvinyl acetate bonding agent that enhances adhesion of plaster or concrete mortars to concrete, masonry, drywall, plaster, browncoats and stucco.

Recommended uses:

  • Bonding plaster or concrete mortar to cementitious or gypsum-based materials


  • Alkali resistant
  • Tinted
  • Brush, roller or spray application
  • Water-based, VOC compliant


  • Stands up to alkali attach from cementitious and masonry materials
  • Easy visual confirmation of coverage
  • Adapts to varied jobsite requirements
  • Complies with federal and regional VOC limits
Order Code Product Description Packaged Min Order
TBOND1 Thorobond 1-Gallon

(MasterProtect P110)

4/box 1 box
TBOND5 Thorobond 5-Gallon Pail

(MasterProtect P110)

per pail 1 pail


Weld-Crete® Concrete Bonding Agent

Weld-Crete® bonds new concrete, stucco, tile setting beds and terrazzo to any structurally sound surface, interior or exterior. Use Weld-Crete’s® open time to your advantage in bonding to concrete shear walls when you need a time lapse between application of bonding agent, placement of reinforcement steel, placement of formwork and placement of concrete. The original chemical concrete bonding agent incorporates polyvinyl acetate homopolymer in a patented formulation.

For more information visit Larsen Product’s website here 

Order Code Product Description Packaged Min Order
WELD Weld-Crete Qts 12/Cs 12/box 1 box
WELD1 Weld-Crete Gallons 4/Cs 4/box 1 box
WELD5 Weld-Crete 5-Gallon Pail per pail 1 pail
  • For exterior and interior use.
  • Will bond new concrete, Portland cement plaster and cementitious mixes to structurally sound concrete floors, walls, columns, beams, steps and ramps.
  • Can be “painted on” in a single application 1 hour to 10 days prior to concrete placement.
  • Weld-Crete® is also used for: bonding setting beds for ceramic tile; bonding Portland cement plaster and stucco mixes; and to bond to surfaces such as brick, block, tile, marble, metal, glass block, soundly adhered paint (non-soluable in water, i.e. casien and calcimine paints), and silicone.



Plaster-Weld® bonds new plaster to any clean, structurally sound, interior surface. The original chemical plaster bonding agent is a patented formulation incorporating polyvinyl acetate homopolymer. DESIGNED FOR INTERIOR USE ONLY, the high performance bonding of one-coat finish plaster and/or two and three coat work to concrete ceilings, walls, columns, beams, and other structurally sound surfaces. Plaster-Weld® prepares the surface to allow you to plaster directly to concrete over electric radiant heat cable, and to bond cement mortar beds to smooth concrete for installation of rigid foam insulation.

For more information please visit Larsen Product’s website here 

Order Code Product Description Packaged Min Order
PLASTER Plaster-Weld Qts 12/Cs 12/box 1 box
PLASTER1 Plaster-Weld Gallons 4/Cs 4/box 1 box
PLASTER5 Plaster-Weld 5-Gallon Pail per pail 1 pail
  • Concrete, brick, block, glass, ceramic tile, wallboard, metals (e.g. sheet lead in x-ray rooms) and marble are suitable sound surfaces, structurally.
  • Plaster-Weld® can be used over paints having oil, rubber or vinyl bases, and over silicone-treated surfaces, as well as latex paints.

ADMIXTURE Cement Bonding Agents

Acryl 60

Acryl 60

Acrylic, polymer emulsion additive for cement-based powders designed to improve adhesion, tensile, compressive, and flexural strengths. Non-yellowing, water-based ideal for both interior and exterior use.

  • Promotes long-lasting repairs.
  • Adds extra toughness and crack-resistance to cement-based mixes.
  • Use for interiors or exteriors; above or below-ground.
  • Improves freeze/thaw stability of cement-based materials.
  • Ideal where hard, strong, fast-curing material is required for patching, repairing or resurfacing.
  • Milky white, colorless and non-yellowing to mixture.
  • Stable, will not re-emulsify when exposed to water.
  • Easy to use. One-component liquid mixes easily with water.
  • Cleans up with soap and water immediately after use.

For more information please visit Thoro’s website here 

Recommended for:

  • Cement
  • Mortars
  • Plasters
  • Stuccos
  • Concrete Mixes
  • Most Cement-based Materials

Add to THOROSEAL®, THORITE® and THOROSEAL® Foundation Coating for:

  • Stronger bonding capability and increased tensile strengths.
  • Complete protection against water, dampness or seepage.


  • Acryl® 60 can be used straight, or be diluted with water 1:3. Coverage will vary depending on application and use.
  • Coverage depends on the suggested mixing ratio for particular uses.
Order Code Product Description Packaged Min Order
ACRYL Acryl 60 Quarts 8/box 1 box
ACRYL1 Acryl 60 Gallons 4/box 1 box
ACRYL5 Acryl 60 5-Gallon Pail per pail 1 pail

SikaLatex R Bonding Agent

Sika® Latex R 

An acrylic based, polymer emulsion. It is non-reemulsifiable and multi-purpose in its use as an admixture to produce latex improved bonding agents, concrete and mortar.


  • As a liquid admixture in cement mortars and concrete to enhance adhesion and overall performance.
  • For sand and cement bonding grouts.
  • With stucco and terrazzo.
  • For patching and flash coats.
  • As a polymer admixture added to SikaRepair® mortars to further improve their performance.

Order Code Product Description Packaged Min Order
SIKAR1 SikaLatex R Bondng Agent/Admix         1 gallon 4/box 1 box
SIKAR5 SikaLatex R Bondng Agent/Admix        5 gallon per pail 1 pail