Liquid · before the finish
Bonding Agent / Primer
The product that prepares the wall — a strong chemical bond between Arcusstone coatings and substrates.
A non-toxic, non-flammable, freeze/thaw-stable liquid re-emulsifying bonding agent — a vinyl-acetate monomer resin compound in compliance with ASTM C 932.
It is required for most Arcusstone material applications, and recommended under the Lime Plasters over new non-porous surfaces or where adhesion is a concern.
You may also see it called ArcusBond.
- Coverage
- 200 – 300 sq ft per gallon
- Sizes
- 5-gallon pails
- Film
- A uniform coat of at least 5 mils, no bare spots
- Standard
- ASTM C 932
Where it goes
- Surfaces
- Exterior and interior cement plaster stucco, poured concrete, masonry, cement board, drywall, ceramic tile, natural stone and gypsum plaster.
- New stucco
- Not necessary over new Portland cement stucco brown coats — but recommended anyway, to even out the suction, prevent flashing from rapid moisture loss, avoid unwanted color variation and aid bonding.
- Existing stucco
- Over existing stucco installations it must be applied.
- Acrylic basecoats
- Required over cementitious acrylic basecoats such as Genesis DM.
- Vertical work
- Broadcast 30-mesh washed, graded sand into the wet bonder to give tooth for a more secure bond — over an EIFS basecoat, apply a generous, uniform coat by brush or roller first.
- Coated shapes
- It provides the chemical bond between an EPS foam core and Stonecoat in manufactured shapes.
Where it does not go
- Do not apply to wet, hot, frozen or thawing substrates.
- Do not apply as a water barrier, or where hydrostatic pressure is present, such as a retaining wall.
- Do not apply to concrete or other substrates poured or placed against earth.
- It will not prevent efflorescence formation.
- Do not use it for Stonecoat over concrete on grade, retaining walls, or horizontal wet-location applications where block-pattern joints are left without a backfill of material in the joints.
The system
- Order
- Bonding Agent / Primer, then the finish, then the Penetrating Water Repellent. This is the primer, not a finish — it is not sealed itself.
- The full system
- Every guarantee covers the full Arcusstone system — primer, finish and sealer together.
- Warranty
- Arcusstone warrants every product to conform to its current published specifications at the time of shipment.
Documents
- Bonding Agent / Primer product data sheetPDF · 170 KBOpen the PDF: Bonding Agent / Primer product data sheet
For questions about the Bonding Agent, the data sheet lists Arcusstone Technical Services at (512) 295-5800.
Technical details
For specifiers and applicators. The product data sheet above carries all of it.
The numbers
- Coverage
- 200 – 300 sq ft per gallon, varying with substrate and method
- Sizes
- 5-gallon pails
- Film
- A uniform coat of at least 5 mils, no bare spots
| Property | Test method | Result |
|---|---|---|
| Fire resistance | ASTM E-119 (bonded assembly) | Passed, 2 hr fire test @ 1800°F |
| Flammability | MIL-B-1923C | Non-flammable |
| Acid resistance | — | Unaffected by alkalinity of cement |
| Freeze-thaw | — | 5 freeze cycles @ −10°F, stable |
| Temp range | ASTM C-109 | No loss of bond, 400 psi |
| Shear bond | ASTM C-1042 | 740 psi average @ 14 days |
| Flexural bond | ASTM C-78 (bonded assembly) | 603 psi average |
| Tensile bond | ASTM C-932 (bonded assembly) | 385 psi average @ 28 days |
| Odor | — | None when dry |
Applying it
- Method
- Brush or roller, to a uniform coat of at least 5 mils with no bare spots. A one-time re-emulsifying bonder.
- Temperature
- For best workability and performance, between 45°F (7°C) and 90°F (32°C).
- Substrate
- Sound, dry, and free of cracks, dirt, efflorescence or other contaminants.
- Mixing
- Ready to use. Stir thoroughly before each use; do not shake or use mechanical mixers.
- Cure
- Let it dry to the touch and cure at least one hour before the Arcusstone material goes over it.
- Timing
- In a dry, interior environment it can go on up to 3 days before the Arcusstone coating; in a damp, exterior environment — humidity, fog, water vapor, condensation — apply it the same day.
- Clean-up
- Immediately, with water and mild detergent, rinsing with clean water; once dry, a solvent such as acetone may be required.
Storage and shelf life
- Store out of direct sunlight, between 40° and 100°F (4.5° to 38°C), on pallets under cover, no more than 2 pallets high.
- Protect from freezing. If frozen, do not add heat — thaw slowly at room temperature and stir thoroughly before use.
- Store opened containers with the lid securely placed, wiping the lip of the bucket before resealing.
- Shelf life: 1 year in unopened original pails, or 6 months once opened and properly resealed.
Arcusstone technical representatives and your regional distributor answer every question about the product and its use — design and detailing, job-site conditions, maintenance, restoration and repair, and LEED project certification.
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