Product Code: BR54002200M1BO

Bona R540 Primer & Damp Proof Membrane (DPM) – 6kg

Name: Bona R540 Primer & Damp Proof Membrane (DPM) – 6kg
Brand: Bona
SKU: BR54002200M1BO
Price: 129.57 GBP
Availability: InStock

£129.57

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Free next-working-day delivery on this item The only exceptions are the postcode areas listed below.

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Unit 1 Penton Business Park, Stephenson Road, Salisbury, SP2 7NP.

Bona R540 Primer & Damp Proof Membrane is a professional one-component polyurethane primer designed to prepare absorbent and non-absorbent subfloors before the installation of wood flooring using Bona silane and polyurethane adhesives.

As well as improving adhesion, Bona R540 acts as a moisture barrier on suitable cementitious subfloors and helps reinforce weak or dusty substrates before flooring installation.

Why Choose Bona R540?

Primer and damp proof membrane in one product
Moisture barrier up to 95% RH / 5 CM%
Suitable for absorbent and non-absorbent subfloors
High penetration into prepared substrates
Helps strengthen weak or dusty subfloors
Compatible with Bona silane and polyurethane adhesives
Easy roller application
Suitable for underfloor heating systems

Suitable Substrates

Bona R540 is suitable for correctly prepared:

Concrete floors
Cementitious screeds
Calcium sulphate screeds (where approved)
Suitable absorbent subfloors
Suitable non-absorbent subfloors
Weak or dusty mineral subfloors requiring reinforcement

D501 or R540?
Choose Bona D501 where you simply need an adhesion primer and dust binder. Choose Bona R540 where moisture suppression or additional subfloor reinforcement is required before installing your wood flooring.

Technical Information

Product type	1-component polyurethane primer & damp proof membrane
Pack size	6kg
Coverage	Up to approximately 35m² per container
Moisture protection	Up to 5 CM% or 95% RH (subject to Bona installation guidelines)
Application	Roller or brush
Suitable for UFH	Yes
Compatible adhesives	Bona silane and polyurethane adhesives

Coverage is approximate and will vary depending on substrate porosity, surface texture and application method.

Compatible Bona Adhesives

Once prepared, Bona R540 can be used before applying:

Application

Ensure the subfloor is clean, dry and structurally sound.
Remove all loose dust, laitance and contaminants.
Apply Bona R540 evenly using a suitable roller or brush.
Allow the primer to cure in accordance with the Technical Data Sheet.
Install the selected Bona adhesive once the primer has fully cured.

Important: Always refer to the latest Bona Technical Data Sheet before use. Moisture protection limits, curing times and application methods depend on the substrate type and site conditions. Carry out moisture testing before selecting the appropriate subfloor preparation system.

1. What is Bona R540 used for?

Bona R540 is a one-component primer designed to be used on porous and non-porous surfaces prior to applying Bona silane-based adhesives, such as Bona R848. It acts as a moisture barrier and improves the adhesion of the adhesive, making it ideal for problematic or damp subfloors.

2. How do I apply Bona R540?

Bona R540 can be applied using a roller or brush. Ensure the subfloor is clean, dry, and free from dust or contaminants. Apply an even coat and allow it to dry fully before applying the adhesive. For very damp subfloors, a second coat may be required.

3. How long does Bona R540 take to dry?

Under normal conditions (20°C and 60% relative humidity), Bona R540 dries in approximately 1-2 hours. If a second coat is needed, wait for the first coat to dry completely before applying the next layer. The final adhesive application can proceed once the primer is fully dry.

4. What types of subfloors are compatible with Bona R540?

Bona R540 is suitable for a wide range of subfloors, including concrete, screed, plywood, and chipboard. It can be used on both porous and non-porous surfaces, making it a versatile option for various subfloor conditions.

5. Can Bona R540 be used as a moisture barrier?

Yes, Bona R540 acts as a moisture barrier when applied to damp subfloors. It is effective in controlling residual moisture and preventing moisture from affecting the bonding of wood flooring. For subfloors with high moisture levels, multiple coats may be necessary to provide adequate protection.

6. How many coats of Bona R540 should I apply?

In most cases, one coat of Bona R540 is sufficient for normal subfloor conditions. However, for subfloors with higher moisture content or those that are more problematic, a second coat may be required. Always follow the manufacturer’s guidelines for your specific project.

7. Can Bona R540 be used with underfloor heating?

Yes, Bona R540 is compatible with underfloor heating systems. Its moisture barrier properties help protect the wooden floor and adhesive from the effects of fluctuating temperatures and moisture that can occur with underfloor heating.

8. Is Bona R540 environmentally friendly?

Bona R540 is a solvent-free, low VOC product, making it environmentally friendly and safe for indoor use. It is GREENGUARD certified, meeting high standards for indoor air quality.

9. How do I clean up after using Bona R540?

Tools and equipment used to apply Bona R540 can be cleaned with water while the primer is still wet. Once dried, the primer is more difficult to remove, so it’s important to clean tools immediately after use.

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