Can Drywall Mud Be Applied Directly Over Plaster Walls?

When it comes to renovating old plaster walls, many homeowners wonder if they can simply apply drywall mud directly over the existing surface. The answer is yes, but there are a few important considerations to keep in mind.

Preparing the Plaster Surface

Before applying drywall mud, it’s crucial to properly prepare the plaster surface. Start by removing any loose or crumbling plaster with a putty knife or scraper. If there are large cracks or holes, you may need to cut out the damaged area and patch it with drywall compound or plaster of Paris.

Once the surface is clean and smooth, you can apply a primer designed for use on plaster. This will help the drywall mud adhere better to the wall. Some popular options include:

• Oil-based primers
• Acrylic latex primers
• Specialty plaster primers

Allow the primer to dry completely before proceeding.

Applying Drywall Mud

When applying drywall mud over plaster, it’s best to use a quick-setting compound like Durabond or Easy Sand. These products are designed to adhere well to difficult surfaces like plaster. Mix the compound according to the manufacturer’s instructions, and apply it to the wall using a putty knife or drywall knife.

For best results, apply the mud in thin, even coats, allowing each coat to dry completely before adding the next. You may need to apply several coats to achieve a smooth, even finish.

Once the final coat of mud is dry, sand the surface lightly to remove any bumps or ridges. Be sure to wear a mask or respirator to avoid breathing in the fine dust particles.

With proper preparation and the right drywall mud, you can successfully apply a smooth, even finish over existing plaster walls. Just take your time, follow the manufacturer’s instructions, and be patient as the mud dries between coats.