Vulkem 191 QD Primer – Rapid Interlaminary Primer for Weather-Disrupted Waterproofing

Don't let weather delays compromise your waterproofing system. Vulkem 191 QD Primer is a specialized, rapid-curing interlaminary primer designed to solve a critical problem in liquid-applied membrane installation: loss of tack between coats due to rain, dew, or prolonged exposure. This quick-drying, one-part primer "re-invigorates" the surface of an existing Tremco polyurethane membrane, creating a perfect bonding substrate for the next layer, ensuring a monolithic, fully adhered system.

By allowing overcoating in as little as 30 minutes, Vulkem 191 QD Primer gets projects back on track fast, minimizing the impact of unpredictable weather and preventing costly rework. It is the insurance policy every contractor needs for multi-coat waterproofing applications.

Key Features & Benefits:

• Saves Time & Prevents Rework: Reactivates existing membranes that have lost their initial tack, preventing the need for costly removal and re-application.
• Rapid Overcoating: Allows for the next membrane layer to be applied within 30 minutes of primer application, accelerating project recovery after weather delays.
• Ensures Monolithic Bond: Promotes perfect interlaminary (between-layer) adhesion, creating a single, unified waterproofing membrane without weak points.
• Single-Component Convenience: Ready-to-use straight from the container, ensuring efficient material use and easy application for targeted areas.
• Weather Resilience: Mitigates the impact of rain, humidity, and overnight dew on the application schedule and final system performance.
• Low Odour Formula: More pleasant for applicators to work with, especially in confined or occupied spaces.

Primary Applications:

• Interlaminary Priming: Between coats of Tremco polyurethane membranes (e.g., Vulkem 350R, Vulkem 360) when the initial tack has been lost.
• Post-Recovery After Weather Events: To salvage a membrane surface after unexpected rain, condensation, or dust contamination.
• Re-invigorating Aged Surfaces: Preparing a membrane that has been exposed for longer than the recommended overcoat window for the next layer.
• Sealant over Membrane: Promoting adhesion of polyurethane sealants to fully cured membrane surfaces.

Why Choose Vulkem 191 QD Primer?
Vulkem 191 QD Primer is more than just a primer; it's a project recovery tool. It directly addresses one of the most common and frustrating issues in waterproofing application, turning a potential failure into a simple, quick fix. Its rapid dry time and reliable performance provide contractors with the confidence to proceed with multi-coat systems, even when facing uncertain weather.

Do not apply over contaminated or damp surfaces.
Do not thin.
Do not leave exposed for a prolonged period of time as it will yellow and lose effectiveness.