How Do You Seal Plaster of Paris Before Painting?

By Anna Duncan

Plaster of Paris is a popular material used for creating sculptures, decorative items, and other art pieces. Before painting your plaster of Paris creation, it’s important to seal it properly to ensure the paint adheres well and the surface is protected from moisture. In this tutorial, we will guide you through the steps of sealing plaster of Paris before painting.

Materials Required:

  • Plaster of Paris creation
  • Sandpaper (various grits)
  • Paintbrush
  • Primer
  • Acrylic sealer spray

Step-by-Step Process:

Step 1: Sanding the Surface

The first step in sealing plaster of Paris is to sand down the surface. This will help remove any rough spots or imperfections that may have been created during the molding process.

Start by using a rough grit sandpaper (such as 80 grit) and gradually work your way up to a finer grit (such as 220 grit). Be sure to wipe away any dust or debris after sanding.

Step 2: Applying Primer

Once you have sanded down the surface, it’s time to apply a primer. A primer will help create a smooth surface for painting and ensure better adhesion of the paint.

Apply an even coat of primer using a paintbrush, making sure to cover all areas evenly. Allow the primer to dry completely before moving on to the next step.

Step 3: Applying Acrylic Sealer Spray

After applying primer and allowing it to dry, it’s time to apply an acrylic sealer spray. This will provide an added layer of protection against moisture and help seal any small cracks that may exist in the plaster.

Hold the can of spray approximately 8 inches away from the surface and apply a light, even coat. Allow the sealer to dry completely before applying any paint.

Step 4: Painting

Once you have sealed your plaster of Paris creation, you are ready to paint it! You can use a variety of paints, including acrylics and oils. Be sure to follow the manufacturer’s instructions for your chosen paint and allow it to dry completely between coats.

Tips:

  • Be sure to wear a mask while sanding to avoid breathing in any dust.
  • If there are any large cracks or holes in your plaster of Paris creation, use spackling or joint compound to fill them before sanding.
  • For added protection, you can apply multiple coats of sealer spray.

Conclusion:

Sealing your plaster of Paris creation before painting is an important step in ensuring its longevity and protecting it from moisture damage. By following these simple steps and using the right materials, you can create a beautiful finished product that will last for years to come. Happy creating!