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Transparent Knife Grade 1 Qt Polyester
Wood & Stone II Transparent Knife Grade 1 Quart

Our Price: $33.17
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Product Code: F022537


Transparent Knife Grade 1 Quart Polyester Adhesive

Transparent Knife Grade Polyester Adhesive Glue is a polyester based adhesive for use with natural stone. In fact, it is especially compatible with marble. This adhesive is a two-part honey-colored glue. It is translucent, fast setting, and easy to apply.

Transparent Knife Grade is a high viscosity paste that is highly thixotropic and resistant to sagging. All the formulations are cured using a benzoyl peroxide hardening paste.


Transparent Polyester Glue formulations are best suited for interior applications on natural or cast stone, especially marble. However, they may be used for the following applications as well:

  • Consolidating or Laminating Slabs
  • Bonding or Patching Broken Stones
  • Reinforcing Fragile Material
  • Filling Porous or Chipped Stones

This Knife Grade transparent stone glue is excellent for general repair and bonding of vertical pieces where minimal sag is desired. It may be used to fill large cracks and holes.

Additionally, this knife grade formula is easily colored to match any stone using our stone glue coloring pastes. The best shade can be obtained by mixing the product to a shade slightly darker than the actual stone color.

Directions for Use:


All surfaces must be dry and free of grease, oil, efflorescence and dust. Transparent Knife Grade Polyester Glue products will bond to moist surfaces; however, a dry surface will provide the best results. Because our products do not bond with polyethylene plastics, containers of this material are ideal for mixing purposes.


If needed, add Polyester Coloring Pastes to the mastic before mixing the mastic with the hardening paste. The correct amount of hardener is 2% to 4% of mastic by weight; this is approximately a 1/2" to 1" bead of hardener for every tablespoon of mastic. Additional hardener speeds the curing time, but causes a deeper yellowing and reduces the bond strength. Too little hardener will result in a mixture that will not cure. Ambient temperature also affects the curing time. Warmer temperatures speed the curing process, while temperatures below 32°F (0°C) will require heating the mixture to start the curing process. The product should be mixed thoroughly and will remain workable until gelling occurs, at which point the product becomes rubbery and excess material may be removed with a razor or chisel. The product should not be worked once gelling has begun.

When bonding stones together, clamps and jigs should be used to ensure a thin bond layer (less than 0.016 inches/0.4 mm) is achieved, thereby providing the strongest bond. After curing, the stone piece may be further processed without damaging the material.

Clean Up:

After use, equipment may be cleaned with toluene or acetone. Hands should be cleaned with Waterless Hand cleaner or an appropriate solvent such as Cupran.

Physical Properties
Characteristic Method Transparent Flowing Transparent Extra Penetrating Transparent Knife Grade
Color Visual Honey Honey Honey
Aspect Thin Syrup Water-like Thick Paste
Viscosity at 77 °F (25°C) (cps) ASTM D2393 1,040 (Spl. 3 @ 20 rpm) 170 (Spl. 1 @ 50 rpm) 360,000 (Spl. 7 @ 10 rpm)
Pot life at 77°F (25°C) (3% hardener, minutes) 4 to 5 4 to 5 4 to 5
Curing Time (Thin film, minutes) 16 to 18 16 to 18 16 to 18
Sag Flow Yes Yes No
Typical Properties fo Cured Product
Shrinkage (ASTM D2566) % 2.03% 2.80% 1.95%
Shore D Hardness (ASTM D2240) Shore D 80 88 85
Tensile Strength (ASTM D638) psi (MPA) 8,500 (59) 7,000 (48) 5,600 (39)
Compressive Strength (ASTM D695) psi (MPA) 15,000 (103) 9,500 (66) 11,100 (77)
Flexural Strength (ASTMD790) psi (MPA) 14,400 (99) 11,900 (82) 14,300 (99)
View Printable Technical Data Sheet

Storage Conditions

  • Always keep the container tightly sealed when not in use, and never expose the hardener to temperatures in excess of 100°F (38°C).
  • Products are chemically inhibited to extend shelf life and improve product consistency. Storage temperature, however, is an extremely important factor in maximizing the shelf life of the products. The materials should be stored in a cool environment (50°F (10°C)) whenever possible and should never be exposed to direct sunlight.
  • If these procedures are followed, the transparent polyesters should have a shelf life of at least one (1) year

Precautions and Safety

Observe all measures as described on the container and product MSDS. Avoid contact with skin, eyes, and respiratory system. Use protective gloves and work in a well ventilated area.

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