How To Make Outdoor Chalkboard Paint Waterproofing

How to Waterproof Outdoor Chalkboard Paint

Creating custom outdoor chalkboards is a fun and easy way to add a touch of creativity and functionality to your patio, garden, or play area. But if you want your chalkboard to withstand the elements and last for years to come, it's crucial to waterproof it properly.

This guide will provide you with comprehensive step-by-step instructions on how to waterproof outdoor chalkboard paint using simple materials and techniques. By following these steps, you can ensure that your chalkboard remains vibrant and functional through rain, sun, and other outdoor conditions.

Materials You'll Need

Outdoor chalkboard paint
Exterior-grade polyurethane
Paintbrush or roller
Stir stick or paint mixer
Clean rags
Sandpaper (optional)

Step 1: Prepare Your Chalkboard Surface

Before you start painting, it's essential to prepare the surface of your chalkboard properly. If your chalkboard is already painted, make sure it's clean and free of any dirt or debris. You can use a damp cloth or sandpaper to remove any imperfections.

If you're creating a chalkboard from scratch, start by applying a coat of outdoor chalkboard paint to the surface. Allow it to dry completely according to the manufacturer's instructions.

Step 2: Apply Exterior-Grade Polyurethane

Once your chalkboard paint is dry, it's time to apply a protective layer of exterior-grade polyurethane. Polyurethane is a clear, durable finish that will help protect your chalkboard from water damage and other environmental factors.

Use a paintbrush or roller to apply a thin, even coat of polyurethane over the entire surface of the chalkboard. Allow the first coat to dry completely before applying a second coat.

Step 3: Sand and Recoat (Optional)

After the second coat of polyurethane is dry, you can sand the surface lightly with fine-grit sandpaper to smooth out any imperfections. This step is optional, but it will help give your chalkboard a professional finish.

Once you're satisfied with the smoothness of the surface, apply a final coat of polyurethane to seal it in. Allow the chalkboard to dry completely before using it.

Tips for a Durable Waterproof Finish

Use high-quality outdoor chalkboard paint and polyurethane.
Apply multiple thin coats of polyurethane, allowing each coat to dry completely before applying the next.
Avoid using polyurethane with a UV inhibitor, as this can block chalk from adhering to the surface.
Reapply polyurethane every year or as needed to maintain the waterproof seal.
Store your chalkboard in a dry place when not in use.