How To Apply Intumescent Paint – A Beginner’s Guide

Where can Intumescent Paint For Steel be Used? Fire protection system


If you’re looking to protect your building from fire, intumescent paint is a great option. This type of paint swells up when exposed to heat, creating a protective barrier that can prevent the spread of flames. In this tutorial, we’ll walk you through the steps of applying intumescent paint.

Step 1: Prepare the Surface

Before you begin painting, you need to make sure the surface is clean and free of debris. Use a wire brush or sandpaper to remove any loose paint or rust. If there are any cracks or gaps, fill them with putty and sand them down until they’re smooth.

Step 2: Apply the Primer

Next, apply a coat of intumescent primer. This is important because it helps the paint adhere to the surface and provides an extra layer of protection. Make sure you follow the manufacturer’s instructions for mixing and apply the primer evenly.

Step 3: Apply the Intumescent Paint

Once the primer is dry, it’s time to apply the intumescent paint. Again, follow the manufacturer’s instructions for mixing and applying the paint. Make sure you apply it evenly and cover the entire surface. Depending on the thickness of the paint, you may need to apply more than one coat.

Step 4: Allow the Paint to Dry

After you’ve applied the final coat of paint, allow it to dry completely. This may take several hours or even overnight. Make sure you don’t touch the surface until it’s completely dry.

Step 5: Inspect the Surface

Once the paint is dry, inspect the surface to make sure there are no cracks, gaps, or uneven areas. If you find any issues, you’ll need to sand them down and apply another coat of paint.

Step 6: Clean Up

After you’ve finished painting, clean up any tools or materials you used. Make sure you dispose of any paint or primer properly, according to your local regulations.


Applying intumescent paint is a great way to protect your building from fire. By following these steps, you can ensure that your surface is properly prepared and the paint is applied correctly. If you’re unsure about any part of the process, be sure to consult the manufacturer’s instructions or seek professional help.