by Martin
February 2021

Tools & materials you will need

  • plasterboard
    stanley knife
    gyprock saw
    two pieces of soft pine
    drill with philips head screw attachment
    plasterboard screws
    drop sheet to protect floor
    fibreglass tape
    premixed plaster

2 x plaster trowels
small trowel
fine sponge sanding block
primer sealer undercoat
low sheen acrylic wall paint
acrylic wall paint rollers
paint roller and roller tray
paint brush

Handy tips:
1.  It’s a good idea to cut the existing hole into a geometric shape. This makes the job so much quicker and easier than trying to match the hole with a piece of plasterboard.

2. Fibreglass join tape reinforces the plaster and ensures that cracks won’t form on the joins once you have finished plastering.


Step 1:
Safety first: Check to make sure there are no electrical wires or plumbing in the wall where you’re working. Lay out your drop sheet to protect the floor and break away loose edges of plaster from around the hole.

Step 2:
Cut a piece of plasterboard slightly bigger than the hole in a geometric shape. This gives you a template to cut out and your piece of plasterboard will fit neatly into that hole.

Step 3:
Place the piece of plasterboard over the hole and trace around the outside edge with your stanley knife, with just enough pressure to mark the wall. This mark be your guide for cutting out.

Step 4:
Using a plasterboard saw, cut along the traced edge you’ve drawn.

Step 5:
You’ll be securing 2 pieces of pine firmly to the inside surface of the plasterboard. To achieve this, use a drill with a philips head bit to screw through the plasterboard into the pine in 2 places on each side, at the top and bottom.

See picture for positioning

Take one of the pieces of pine and hold it firmly on the inside of the plasterboard.

Using your drill with a philips head bit, screw through the plasterboard and into the pine until the pine pulls up tightly behind the plasterboard. There’s no need to push the drill, it’s important to always let the drill do the work.

Make sure the screws are countersunk into the plasterboard so when you run your hand over the area you don’t feel the metal screw head.

Repeat this process on the other side of the hole so the 2 pieces of pine are firmly attached at the top and bottom on the inside of the wall.

See picture below.

Now you have a firm backing to hold your piece of plasterboard in place.

Step 6:
Place the cut piece of plasterboard into the hole you have prepared. It should fit perfectly. Secure the plasterboard in place by using your drill to screw through the plasterboard into the pine each side. Make sure screws are countersunk into plasterboard (See picture)

Step 7:
Fibreglass joining tape – this product has a sticky side. Cut 2 lengths, 1 for the top and 1 for the bottom and ensure the join is postioned in the center of the tape. Stick tape to wall. Cut 2 pieces for the sides, position and stick. This tape reinforces the area and prevents cracking.

Step 8:
Apply pre mixed plaster over the area using plaster scrapers. Use smooth stokes. Apply in a downward motion and then crossways motion and repeat. Leave this to dry 24 hours.

Step 9:

Using a small metal trowel gently remove any small imperfections. Repeat steps 8 and 9 2 times more times.

Step 10:
Take the fine sponge sanding block and using circular motions smooth the area of any imperfections. Don’t press too hard.

Step 11:
Using a small paint roller apply a coat of primer sealer undercoat only to the newly plastered area. Let dry for 2 hours. (Check paint manufacturer guidelines for product drying time in case it varies). Take paint roller and tray outside onto the grass. Use a garden hose to wash tray and clean the roller with water. Don’t wash out in a sink. Think environmentally friendly

Step 12:

Paint wall with two coats of low sheen acrylic wall paint.


Take your paint roller and apply the first coat of low sheen wall paint. Allow to dry. Check can for recommended drying time.

Repeat for second coat.


If you have the original paint you may be able to just paint the patched area with 2 coats. Otherwise you’ll need to paint the whole wall so that the patch isn’t obvious.


Tip: If you don’t have the paint color, grab a piece of the plasterboard from the original hole with the color on it and take it to your paint store. They will color match for you.


How to store paint roller and brushes between coats

Place roller, brushes and roller tray in a plastic bag and tie at the top. This will prevent brushes and rollers from drying out. When you’re ready to apply the next coat, simply remove from the bag and get started.


When you’ve finishing the final coat take the roller, brushes, and paint tray outside and wash thoroughly on the grass with plenty of clean water. Hose off the grassed area well. Don’t wash paint down the sink, it’s not good for the environment.

That’s now a job well done! See there’s absolutely no need to outsource this kind of job. It’s easy to do and you can achieve a great result.

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