How To Apply Waterproof Spray Paint- A Step-by-Step Guide

pexels felicity tai 7951238 How To Apply Waterproof Spray Paint- A Step-by-Step Guide

Poor preparation and paint application can make even the best waterproof spray paint fail at withstanding moisture. As a DIY enthusiast, I can guide you through my research and experience in achieving the best results with this particular question: how to apply waterproof spray paint?

Applying waterproof spray paint is easy. Firstly, wash and sand the surface to get a smooth surface. Cover the surface with a primer to ensure the paint adheres properly. Next, apply the paint evenly in thin layers, and once the final coat is ready, you can finish it with a sealer.

Weather-proof spray paint is an effortless way to spruce up different surfaces and keep them looking as good as new. But, if you don’t follow the application process correctly, you may end up with a paint job that washes off with the next rain. So, let me reveal how you can achieve excellent results with waterproof spray paint.

Tools/ Equipment You Will Need

The success of a DIY paint job depends on the tools and equipment you use. Here are a few things you should keep handy before you begin.

  •  Soft bristle brush- for cleaning the surface
  • Soapy water
  •  Paint thinner or rubbing alcohol (if needed)
  •  Fine grit sandpaper
  • A rag cloth
  • A primer
  • A waterproof sealer

Steps To Get Waterproof Results With Spray Paint

Most spray paints have high levels of volatile organic compounds (VOCs) that can be detrimental to health. Hence, wearing protective gear such as a face mask or respirator is necessary before you begin spray painting.

Also, make sure that the paint you’re using for the project is waterproof and not just water-resistant. If you are unsure about the difference between them, you can read our blog on Is spray paint waterproof to get a better idea.

Now, let’s get started.

Step 1: Clean the Surface

It is always better to paint on a clean surface as it ensures a smooth finish without any dust particles trapped underneath. Clean the surface with soap, water, and a soft bristles brush.

If you are working with highly saturated items or plastic, paint thinner or rubbing alcohol can help speed up the cleaning time. Allow the wet surface to dry completely before moving on to the next step.

 Step 2: Sand the Object

To ensure your spray paint adheres to the surface properly, removing any dust or debris is essential. You can use fine-grit sandpaper to achieve a smooth and even surface. Don’t forget to wipe away the sanding residue with a clean rag or tack cloth afterward.

Step 3: Apply A Primer

While a primer is not necessary for all spray paint projects, you should always prime furniture and outdoor items. In addition, a primer is crucial when using water-based spray paints as it helps the paint stick to any surface and keeps water and moisture from breaking the color down over time.

Apply a primer compatible with your selected paint, following the instructions on the label.

Step 4: Start Painting

The paint application is a critical part of creating a waterproof surface. Start spraying paint in thin, even layers, ensuring the entire surface is covered. Any missed spots mean that water may get beneath the painted surface and result in cracks. You want to avoid spraying on the paint too thick and allow plenty of drying time between coats.

You may need two to three thin coats of paint to achieve your desired color and finish. Don’t forget that dry time is critical, so it’s better not to rush the process.

Step 5: Seal the Paint

While you don’t need to seal all types of spray paints, it is recommended to use a sealer for longevity. A clear and waterproof spray paint sealer can help preserve the paint color and make the coat more durable.

If you’re using waterproof spray paint, skipping the sealer for indoor projects is okay, but if the paint is only water-resistant, the sealer is necessary to protect surfaces from water and moisture damage.

five steps to apply waterproof spray paint
Steps to apply waterproof spray paint


How do you waterproof spray paint?

If you want the paint to be weather-resistant, it’s best to apply waterproof spray paint. You can also use a waterproof sealer on top of regular paint to make it last through rain and snow. While a single coat of sealer may be enough, you can add multiple layers depending on your project’s vulnerability to moisture.

Can you make spray paint last on metal?

Yes, you can make spray paint stick to metal and also last by using a primer underneath. For permanent results, it’s recommended to use water-based acrylic paints or oil-based paints. Don’t forget to apply a sealer at the end to make the project waterproof.

How long does spray paint take to harden fully?

Different types of paints have varied drying times. Water-based paints harden more quicker than oil-based paints. Lacquer spray paint is the quickest to dry, with only 20 to 30 minutes of drying time.


A spray paint DIY takes time and energy, so why not make it waterproof while you’re at it? With the right tools and technique, you can achieve a flawless finish and also make your project last longer with techniques that that explain how to apply waterproof spray paints.

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