R540 Moisture Barrier/Primer (5 Liter)

Product Description: Bona R540 Polyurethane Reactive Primer

Bona R540 is a high-performance polyurethane reactive primer that seamlessly integrates with the entire Bona Adhesive System. This primer is specifically engineered to reduce vapor transmission on both absorbent and non-absorbent floors, including those with gypsum-based underlayment.

When applied with a 1250G or 1500G trowel and any Bona Adhesive, only one coat of Bona R540 is necessary. In other installations where these criteria are not met, two coats are recommended.

Key Features:

• Effectively reduces potential moisture issues, such as cupping, from below the membrane in both new and existing constructions.
• A single coat provides damp proofing for concrete subfloors with up to 95% relative humidity (RH) and 18 lbs moisture.
• Fast drying, allowing for immediate nail-down installations.
• Easy application with a roller.
• Suitable for underfloor heating systems.
• For radiant heat systems, provides moisture protection up to 6 lbs or 80% RH.

This versatile primer not only ensures enhanced moisture mitigation but also contributes to the durability and longevity of your flooring installation.