SpecWeld 
A ready-to-use, re-wettable polyvinyl acetate (PVA)
SpecWeld is a versatile, ready-to-use, re-wettable polyvinyl acetate (PVA) emulsion used as both an admixture and bonding agent. It is formulated to bond new concrete, underlayments, masonry, stucco, terrazzo, and Portland cement/sand mixes to both horizontal and vertical concrete surfaces. It is recommended for interior and exterior use but should not be used in areas subjected to constant moisture, hydrostatic pressure, or continuous water saturation.
- Re-emulsifiable/Rewettable: Enhances the ability to re-bond.
- Superior Adhesive Strength: Provides excellent bonding capabilities.
- Durability: Increases the durability, adhesion, and curing of cement-based mortars and stucco.
- Application Flexibility: Suitable for use even with delays between primer application and subsequent topping or underlayment.
- VOC Compliant: Contains 0 grams per liter of VOCs, making it environmentally friendly.
Application
SpecWeld serves as a primer/bonding agent for underlayments, plaster, and stucco. It can also be used as a bonding admixture for cement-based mortars and stucco, enhancing their adhesion and durability.
Application Guidelines
- Surface Preparation: Ensure surfaces are clean, dry, structurally sound, and free of any contaminants.
- Application Method: Apply SpecWeld uniformly at a rate of 150-250 square feet per gallon using a brush, broom, or sprayer. Ensure full coverage and brush into the surface for a continuous film. It remains slightly tacky when dry, and any accumulation in low areas should be wiped up.
- Drying Time: Typically 2-3 hours at 70°F. Adequate ventilation is required to maintain normal drying times; fans may be used to facilitate this.
- Reapplication: On very porous surfaces, a second application may be necessary. Allow 2-3 hours between applications.
Packaging
- Available in 55-gallon drums, 5-gallon pails, and 1-gallon jugs (four per case).
Shelf Life
- Store in a cool, dry place in the original tightly closed container. SpecWeld has a shelf life of 1 year from the date of manufacture.
Standards
- Meets ASTM C1059 for Latex Agents for Bonding Fresh to Hardened Concrete – Type I.
- Meets ASTM C932 for Surface-Applied Bonding Compounds for Exterior Plastering.