How Thick Should Acrylic Render Be Applied?

Acrylic render has become a popular choice for homeowners, builders, and renovators who want a durable and flexible finish for their walls. Unlike traditional cement render, acrylic render contains polymers that improve adhesion, flexibility, and water resistance. But when it comes to application, one of the most common questions is: how thick should acrylic render be applied?

Acrylic render is generally applied in thin coats, much thinner than traditional cement render. The recommended thickness is usually:

• 1mm to 3mm per coat depending on the product.
  
• Multiple thin coats may be applied if a thicker finish is required.
  

This thin application ensures even coverage, faster drying, and reduced risk of cracking.

The thickness of acrylic render has a direct impact on both performance and appearance:

• Durability: Thinner, even coats bond better to the surface and last longer.
  
• Flexibility: A thinner layer allows the render to flex with the wall, preventing cracks.
  
• Finish: Thin coats achieve a smooth, modern look, while thicker layers may appear uneven.
  
• Drying time: Thin applications dry more evenly and reduce the chance of moisture being trapped.
  

Different surfaces may need slightly different applications. For example, fibre cement sheeting or painted surfaces often only need a thin skim coat, while brickwork may require a little more build-up.

Decorative finishes like smooth, textured, or patterned effects may require varying thicknesses within the recommended range.

Each acrylic render product comes with its own manufacturer guidelines. Some may recommend closer to 1mm, while others allow up to 3mm. Always check the instructions for the specific product being used.

• Applying too thickly: This can lead to cracking or uneven drying.
  
• Skipping preparation: Surfaces should be clean and primed for best adhesion.
  
• Applying in extreme weather: Hot, cold, or wet conditions can affect how render sets, regardless of thickness.
  

• Always follow the manufacturer’s recommended thickness.
  
• Use thin, even coats rather than trying to build thickness in one go.
  
• Allow each coat to dry before applying the next if multiple layers are needed.
  
• Hire a professional renderer for larger or more complex projects.
  

Acrylic render should be applied at a thickness of around 1–3mm per coat, depending on the surface, finish, and product used. Sticking to this range ensures a durable, flexible, and visually appealing finish that will last for years. For the best outcome, always follow manufacturer instructions and consider working with a professional renderer.