Bona R540 is a high-performance, one-component polyurethane moisture barrier designed to protect wooden flooring from residual moisture in mineral substrates. It creates a durable, elastic and moisture-resistant film that significantly reduces moisture migration from the subfloor. Easy to apply and ready to use, Bona R540 is ideal for use prior to parquet installation where moisture control is critical. It also strengthens the surface of weak substrates and improves adhesion for subsequent Bona adhesives. Key Features 1-component PU moisture barrier (DPM) Protects against residual moisture in concrete and screeds Ready to use – no mixing required Excellent adhesion to mineral substrates Elastic, crack-bridging membrane Strengthens weak or dusty substrates Compatible with Bona adhesives Low odour and easy application Recommended Uses Moisture protection before installing parquet or wood flooring Concrete and cement-based screeds Subfloors with residual moisture issues Preparation layer before Bona adhesive systems Application Instructions Ensure substrate is clean, dry, solid and free from dust or grease. Apply evenly using a roller or suitable applicator. Apply 1–2 coats depending on moisture level. Allow proper drying before applying adhesive or flooring. Follow Bona system recommendations for best results. Drying Time Light use / recoatingApprox. 1–2 hoursReady for adhesive applicationAfter approx. 12–24 hours Coverage Approx. 100–150 g/m² per coat, depending on substrate and application method. Technical Data BrandBonaProductBona R540Type1-component polyurethane moisture barrierPackaging6 kgApplication rate100–150 g/m²UseMoisture barrier (DPM)SubstratesConcrete, screeds, mineral floorsCompatibilityBona adhesives and systemsSKUUFSBONAR5403X6 FAQs Is Bona R540 a glue?No — it is a moisture barrier (DPM), not an adhesive. How many coats are needed?Typically 1–2 coats depending on moisture levels. Can it be used on damp floors?Yes — it is designed to block residual moisture in mineral substrates. Can I use Bona adhesive over it?Yes — it is fully compatible with Bona adhesive systems.
