Bathroom renovations

Essential Guide to Waterproof Paint for Bathroom

A new coat of paint can transform a dated and dull bathroom into a modern and bright space.  But it’s important to choose a paint specifically designed to withstand high humidity, condensation, and frequent exposure to water. This is where waterproof paints come in.

There are various types of waterproof paints and paint brands on the market, each formulated to withstand constant exposure to moisture, providing an effective barrier that prevents water penetration and damage. Moreover, many waterproof bathroom paints include mould, mildew-resistant properties, which help keep the space hygienic and free from unpleasant odours.

When selecting a waterproof paint for your bathroom, it is essential to consider factors such as the specific area to be covered, the type of surface, and the desired finish

Table of Contents

Benefits of Waterproof Paint for Bathroom

Waterproof paint offers several advantages that make it a popular choice for a bathroom space. One major benefit is its moisture resistance and capacity to prevent mildew growth.

Bathrooms often have high levels of humidity, which can lead to the development of mould and mildew if not properly addressed. By using a waterproof paint, you can effectively inhibit the growth of these unwanted organisms, maintaining a clean and healthy environment.

Another advantage of using waterproof paint in bathrooms is its durability and longevity. Epoxy paint, for example, is known for its ability to withstand heavy use in high-traffic areas, and its resistance to both chemicals and abrasion. This type of paint forms a strong, protective coating that keeps bathroom surfaces intact and in good condition despite constant exposure to water, cleaning agents, and other potential sources of damage.

In addition to being functional, waterproof paint is also aesthetically pleasing. With a variety of finish options available, such gloss, semi-gloss or soft sheen, homeowners can select a look that best complements their bathroom’s design.

While glossier finishes tend to be more moisture-resistant and easy to clean, they may draw attention to surface imperfections. However, choosing the appropriate finish can result in a bathroom that is not only visually appealing but also easy to maintain.

Lastly, waterproof paint plays a crucial role in protecting the building structure from potential water damage. Once applied, a waterproof membrane is created, which acts as a barrier against water infiltration and leaks, preventing structural damage and costly repairs in the long run. This way, you can ensure your bathroom remains in good condition for years to come.

waterproof paint for bathroom

Waterproof Paint Features

Mould Resistance

One of the essential features of a good waterproof paint for bathrooms is its mould resistance. Bathrooms are an ideal breeding ground for mould due to the constant moisture and humidity levels.

Specialised bathroom paints contain antimicrobial additives that help prevent mould growth, ensuring a clean and healthy environment. Moreover, these paints are designed to withstand high humidity, reducing the chances of mould formation.

Peeling and Cracking Resistance

Waterproof bathroom paint must provide resistance to both peeling and cracking. When low-quality paint is used, it can start to peel and crack, which is not only unattractive but can also affect the bathroom’s structural integrity. Good quality waterproof paint adheres properly to surfaces and forms a bond that can withstand the constant presence of moisture and temperature fluctuations seen in bathrooms.

Another crucial aspect to consider is the thickness of the waterproofing membrane applied to the bathroom walls and floors. High-quality waterproof paint typically offers a thick membrane, more than ten times the thickness of a standard wall paint. This extra thickness is essential in providing the necessary protection against water infiltration, peeling, and cracking.

Popular Types of Waterproof Paint for Bathrooms

Acrylic Paints

Acrylic paints are a popular choice for bathroom walls due to their water-resistant properties. These paints are made from a combination of acrylic polymer emulsions, making them highly durable in high-moisture environments. They dry quickly and are easy to clean, with most brands offering a mildew-resistant finish.

Epoxy Paints

Epoxy paints are highly durable coatings often used in commercial and industrial settings. Their durability and chemical resistance make them suitable for bathroom surfaces, providing a long-lasting and waterproof finish.

They consist of a two-component system – a resin and a hardener – which creates a strong bond to the surface when mixed. However, epoxy paints can be challenging to apply and require proper surface preparation. Also, well-ventilated areas are necessary as they emit strong fumes during the painting process.

Latex-Based Paints

Latex-based paints are another suitable option for bathroom walls. They are water-based paints, also known as emulsion paint, that offers a smooth finish while being easy to clean and maintain. Latex-based paints often contain added mildewcides that help prevent the growth of mould and mildew, making them a practical choice for bathrooms.

Application Techniques for Waterproof Paint

Surface Preparation

Before applying waterproof paint in your bathroom, it’s essential to properly prepare the surface. Start by cleaning the bathroom floor and walls thoroughly to remove dirt, dust, and grease. Use a vacuum cleaner or a dustpan and broom to make sure the area is completely clean. Removing any loose paint, debris, or mould is crucial for the paint to adhere correctly to the surface.

Additionally, any existing cracks or gaps should be filled with a suitable sealant or filler to prevent water penetration. It’s essential to allow the surfaces to dry completely before moving on to the next step.


After the surface is clean and dry, it’s essential to use a primer to ensure proper adhesion of the waterproof paint. Using a paint roller or brush, the primer should be applied to both the floor and the walls, up to a height of 20-30 cm.

Choose a primer compatible with the waterproof paint you’ll be using. Follow the manufacturer’s instructions for drying time and recommended coats. Priming helps create a strong bond between the surface and the waterproof paint, ensuring long-lasting protection against water damage.

Painting Methods

There are two main painting methods commonly used for applying waterproof paint in bathrooms:

  1. Roller: A paint roller is an effective method for covering large areas quickly and evenly. Choose a high-quality roller suited for the specific type of waterproof paint being used. Make sure to apply the paint in thin, even coats, using a “W” pattern to avoid roller marks. Allow each coat to dry as per the manufacturer’s instructions before applying additional coats.
  2. Brush: A brush allows for more precision, particularly around edges, corners, and smaller areas. Use a high-quality brush designed for the type of waterproof paint you’re using. Apply paint in even, brush strokes to ensure a smooth and consistent result. As with the roller method, allow each coat to dry before applying additional layers.
waterproof paint for bathroom

Best Practices for Bathroom Paint Waterproofing


Proper ventilation is crucial for maintaining the integrity of waterproof paint in your bathroom. Ensure that you have an adequate exhaust fan or ventilation system in place to remove excess moisture and prevent condensation. Keeping windows open, if possible, can also improve air circulation and aid in moisture reduction.

Regular Maintenance

It is essential to routinely inspect your bathroom interior walls for any signs of wear, damage, or potential water penetration. Pay close attention to areas that are more susceptible to water damage, such as shower enclosures, around the bathtub, and near the sink. Remember to also check for any visible signs of mould, cracked or peeling paint, and the growth of algae.

Should you notice any of these issues, treat them promptly to maintain the effectiveness of your waterproof paint. Using specialised cleaning products such as mould and mildew removers can help tackle these issues effectively.


Over time, waterproof paint may need to be reapplied to ensure continued protection against water damage. Keep an eye out for signs that the paint might be nearing the end of its effective lifespan, including discolouration or a chalky appearance.

Key Takeaways

Renovating Your Bathroom?

At Hunter Bathroom Renovations, our specialists will assist you in many ways, from material selection to professional paint application. Speak to the experts – contact us today!


Jarrod Adnum

Jarrod Adnum is the founder of Hunter Bathroom Renovations. He is proud to lead an experienced team and support staff that are experts in their field. All staff ensure you are getting the best solutions and service for your bathroom.

waterproof paint for bathroom