What You Need to Repair Plasterboard

Before you start, gather the basics:

• Wall filler or joint compound
• Putty knife
• Sanding paper (multiple grits)
• Detail sander or multi sander
• Dust brush or vacuum + cloth
• Primer and paint (for finishing)

Step 1: Inspect the Damage

Start by checking what you’re dealing with:

• Small holes: screw holes, nail holes, small dents
• Cracks: hairline cracks or cracks along joints
• Medium to large holes: impact damage or broken corners

The repair method is mainly determined by the size of the damaged area.

Step 2: Prepare the Area

Preparation makes a big difference to the final result:

1. Remove loose plaster and dust.
2. If edges are ragged, trim them to a clean shape with a sharp knife.
3. Wipe the surface clean so the filler bonds properly.

For deeper holes, apply filler in layers rather than one thick layer. This reduces shrinkage and cracking.

Step 3: Apply Filler

Use a putty knife to press filler into the damaged area, then smooth the surface so it sits slightly proud of the wall. Allow it to dry completely according to the product instructions.

If the filler shrinks, apply a second thin layer and let it dry again.

Step 4: Sand the Surface Smooth

Once the filler is fully dry, sanding is essential to create a level, seamless surface before painting.

Choose the right sander

• 18V Cordless Detail Sander – ideal for larger plasterboard repairs and faster sanding.
• 12V Cordless Multi Sander – perfect for corners, edges and precise drywall finishing work.

Use the right sandpaper grit

For plasterboard repairs, medium and fine grits work best. Too coarse can leave scratches that will show through paint.

Sandpaper Set (9 pcs – G100, G120, G180)

• G100: leveling the dried filler
• G120: smoothing the surface
• G180: finishing for a clean, professional result

Sandpaper Set (5 pcs – G60, G120, G240)

• G60: only if the filler is very uneven (use lightly)
• G120: smoothing after leveling
• G240: final pass for a paint-ready finish

Explore sanding tools and accessories

Step 5: Clean, Prime and Paint

After sanding, remove dust using a brush or vacuum and wipe the area with a dry cloth. Run your hand over the repair, it should feel smooth with no noticeable edges.

Apply primer first (especially if you used a porous filler), then paint to match the wall. This helps the repaired area blend in evenly.

How to Fix Larger Holes in Plasterboard

For larger holes, filler alone may not be enough. A stronger repair usually involves adding support behind the wall.

1. Cut the hole into a clean square.
2. Fix wooden battens behind the opening with screws.
3. Screw a new piece of plasterboard onto the battens.
4. Apply joint compound, let it dry, then sand smooth.

A cordless detail sander helps you finish larger repairs faster and more evenly.

Get a Smooth, Professional Finish

Fixing plasterboard doesn’t require professional skills, just the right steps and reliable sanding tools. Whether you’re repairing small cracks or larger holes, careful sanding makes all the difference.