Render Over Paint: Is It Possible? What You Need to Know

Applying render over a previously painted surface is a common question among homeowners and builders looking to refresh or upgrade their walls. Whether you want to modernise an old facade or repair a tired interior, understanding the right approach is crucial for a durable and long lasting result.

Can You Apply Render Over Paint?

Yes, it is possible to apply render over a painted surface, but proper preparation is essential. Unlike fresh masonry, painted surfaces create a barrier that can prevent the render from adhering properly. Without the right preparation, the render is likely delaminate, crack, or peel over time.

Factors to Consider Before Rendering Over Paint

1. Condition of the Painted Surface

Before applying render, assess the condition of the existing paint. If the paint is peeling, flaking, or chalky, it's best to be removed all together, as a weak base will compromise the render’s adhesion.

2. Type of Paint Used

Some paints, particularly oil based or glossy finishes, are more challenging for render to bond with. In these cases, additional preparation may be required.

3. Surface Preparation

Proper preparation is key to ensuring a strong bond between the render and the painted surface. This typically includes:

• Cleaning – Remove dirt, grease, and mildew using a pressure washer or cleaning solution.

• Sanding or Etching – Roughening the surface to create a better key for the render to adhere.

• Applying a Bonding Agent – Using a suitable primer or bonding product to promote adhesion.

  
  

Rockcote Render Systems: A Reliable Solution

At JM & MJ Solid Plastering, we exclusively use Rockcote render systems, which are designed for versatility and durability. Rockcote offers specialised primers and products that allow rendering over painted surfaces with excellent results.

Recommended Steps Using Rockcote Products:

1. Assess & Prepare the Surface – Clean the walls with a pressure cleaner to remove dirt and any loose or flaking paint and ensure a clean, stable base.

2. Apply Rockcote Keycote or Primer – This helps improve adhesion and provides a strong foundation for the render.

3. Choose the Right Render – Rockcote has a range of render options depending on the desired finish and surface conditions.

4. Apply & Finish – Once applied, the render can be finished with textures, paints, or protective coatings for long lasting results.

   
   

Benefits of Rendering Over Paint

• Refresh the Appearance – A smooth, modern finish can instantly update an old wall.

• Add Durability – Render adds an extra layer of protection against the elements.

• Improve Insulation – Some render systems offer thermal benefits for your home.

• Increase Property Value – A well-rendered exterior enhances curb appeal.

  
  

Get Expert Advice for Your Project

If you’re considering rendering over a painted surface, expert preparation and the right products make all the difference. At JM & MJ Solid Plastering, we specialise in using Rockcote render systems to ensure a high quality, long lasting finish. Need professional advice? Contact us today to discuss the best solution for your home or project.