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I'm preparing to repaint and have chipped off some plaster that was really loose, with both of the holes shown here covering the electrical wiring down to power-points & light switches. I think that was the cause of the plaster coming loose too. The large hole is about 60cm wide + 50cm high. I've previously used Poly Multipurpose Filler for smaller holes & that's worked well, but I think these areas are getting beyond that. Do you have any suggestions? Do I need a plaster base + top coat, or will a single-coat product suffice? The depth is about 10mm too.
Welcome to the Bunnings Workshop community @smped. It's marvellous to have you join us, and many thanks for your question about repairing a wall.
For holes that size on a brick wall, you’ll want something a bit more robust than your usual multipurpose filler. Since this is plaster over brick and not plasterboard, the key is making sure the new plaster bonds well and doesn’t just fall off. Start by misting the exposed brick with water so it’s damp. This stops the brick from sucking all the moisture out of your plaster too quickly. Then apply a hardwall plaster to fill the hole, roughly flush with the surrounding surface. Once that’s set, you can smooth it out with a finer skim coat, to get a really smooth finish. After that, sand it back so it’s flush, prime the patched areas, and you’ll be ready to repaint. This two-step approach, hard wall plaster for strength, then a fine skim for smoothness, works much better than trying a single-coat filler on a 10mm-deep, large area.
Here's a helpful step-by-step guide: How to hardwall plaster a brick wall.
Please let me know if you have any questions.
Mitchell
