Application Uses

Welcome to WELDBOND

Weldbond®  is a universal adhesive that bonds most anything! It is non-toxic, nonflammable, free of fumes, has low VOCs, is created without animal by-products and environmentally friendly!

It carries the EcoLogo™ seal of approval – certifying that it is created without the use of formaldehyde, toxic metals or excessive VOCs.

» Cement & Concrete


Bonds • Strengthens • Adds Flexibility

Weldbond® bonds new cement mixes to old concrete. No hacking, keying or joint raking is required, provided floor was not previously sealed.


Mixing Ratio:  3 parts Weldbond® to 1 part water.

Coverage: 300 to 400 sq. ft. per 3.63 L (gal) depending on thickness.

Application: Trowel/Spreader – based on a thickness of 2/16 – 3/16.

METHOD: Rendering, parging or working with cement, stucco, brick, concrete etc. To render over bricks, terrazzo, tile, formed or precast concrete, or stucco on structurally sound surfaces, prime surface with 1 part Weldbond® mixed with 5 parts water.  Allow to dry.  Before covering surfaces with sand and cement, apply 3 parts Weldbond® to 1 part water.  Render up while still tacky or apply new mix topping while still tacky.

ASTM C1059 Certified.  ASTM is the American Society for Testing and Materials. Weldbond® has been successfully tested as a bonding agent in accordance with ASTM Standard Specifications for latex agents for bonding fresh to fully cured cement. 


Weldbond® will act as a sealer or primer, when diluted. It is inexpensive and easy. Stops porosity and therefore offers a big savings in time and material when gluing, painting or finishing porous materials.

NOTE: Weldbond® is not recommended for use on exposed exterior surfaces.  Garage interiors are acceptable.


Mixing Ratio: 1 part Weldbond® to 5 parts water.

Coverage: 2,000 sq. ft. per 3.63L (gal).

Makes 6 gallons of sealer.

Application: Roller, Sprayer or Brush.

Concrete dusting can be caused by several factors.  You should not need to have the floor replaced unless the condition is very severe.  Try one of the following methods in the order given, until you succeed in controlling it.  It is important to ensure surface has not been previously sealed.

METHOD:  Weldbond® makes an effective concrete sealer.  Mix 1 part Weldbond® to 5 parts water and spread with roller or use a pump type sprayer.  This 5 to 1 mix produces enough sealer to cover 1,400 sq. ft. 

If dusting is minor, a masonry or concrete contractor can apply a chemical hardener, such as zinc or magnesium fluorosilicate, to thoroughly dry concrete.

If dusting is more severe, etch the surface with a mixture of 1 part muriatic acid to 10 parts water.  Repeat application one more time and rinse thoroughly.  Wear eye and skin protection.  If there is no floor drain or sump pump, use a wet vac to pick up the water.

NOTE: Perform only 1 sealing coat, do not repeat.

TERRAZZO, QUARRY, FLAGSTONES, ETC. : Seal base of floor and tiles with 1 part Weldbond® to 5 parts water and allow to dry. Before bedding tiles in sand and cement screed, give floor and base of tile a further coat of 3 parts Weldbond® to 1 part water. While still tacky apply sand and cement bedding to base and bed tiles. Bedding can be from 1/8 inch upwards.


PARQUET WOOD BLOCK AND STRIP FLOORING : Can be easily fixed using concentrated Weldbond® applied to the back. Uneven surfaces can be leveled by adding a little plaster or cement to Weldbond® to form a paste. Porous floors first must be primed with 1 part Weldbond® to 5 parts water. 

CONCRETE ADDITIVE:  Use 1 part Weldbond® thinned with 10 parts water as you are mixing water in cement or concrete mix. These floors will stand up to the most difficult conditions.  

APPLICATION TIP: Increasing compression strength for large project; Approx. 30 gallons of water are required for 1 yard of cement.  Add 3 gallons of Weldbond® to 30 gallons of water. 

RENDERING OR PARGING: When rendering over bricks, terrazzo, tiles, formed or pre-cast concrete, first prime existing surfaces with a mixture of 1 part Weldbond®  to 5 parts water. Allow to dry. Before you cover these surfaces with sand and cement, apply a mixture of 3 parts Weldbond®  to 1 part water. Render up while this is still tacky. Rendering can be from feather edge upwards.

REPAIRS TO CONCRETE, STONE, BRICK AND TILE: Mix 1 part Weldbond®, 1 part water and 5 parts filler (plaster, tile grout, mortar mix or sand mix cement). If repair materials are porous, seal first. When sealed surface is dry apply the adhesive mix best suited to your materials. 

SANDMIX CEMENT AS AN ADHESIVE: Mix 1 part Weldbond® with 1 part water. Stir this into sandmix cement to the desired consistency and the mixture becomes an adhesive. This can be used for general concrete repairs including repairs to the edges of concrete stairways or porches, cracks in concrete floors or walls. Before this adhesive mix is applied, the surface should be sealed with a mixture of 1 part Weldbond® and 5 parts water and allowed to dry. Open cracks and porous surfaces should first be sealed with the same 1 to 5 mix and allowed to dry before the adhesive mix is applied. Cracks should first be chiseled out in the form of an inverted V, sealed, then the adhesive mix trowelled in from the bottom up. The mixture will lock into the crack.