Mix the powdered gap filler in a bucket with some water until it's the consistency of toothpaste. Using your paint scraper, apply it to all of the cracks and chips on the wall, making sure to overfill them.
Use a multi-purpose gap sealer and a caulking gun to fill the gaps in the corners of the walls. After applying the gap sealer, use a damp cloth to wipe off any excess. This will also make it smooth and push the filler it into the corners. You may need a second layer of gap filler to finish off.
When your gap filler is dry, use sandpaper on a hand sander to get a smooth finish. Remember to wear a dust mask when you're sanding. Wipe away any dust and your walls are ready to undercoat or paint.
Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.
When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.