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How to seal a white set plaster wall

White paint being poured into a bucket

Overview

If you're painting a white set plaster wall, it's important to seal it first. White set has lime products in it, which can burn the paint if the wall is not properly sealed. In just a few steps, we'll show you how to prepare the sealer, cut in the wall's edges, and seal the wall in just a few simple steps.

Steps

1Prepare the sealer

First, put on your respirator mask because sealer fumes can be quite potent. Remove the can lid and mix the sealer thoroughly with a stirrer. Then pour the sealer into your bucket. 

White paint being poured into a bucket

2Cut in the edges

Before you start sealing the walls with your roller, cut in the edges using a paintbrush. Cutting in is when you use a paintbrush to paint areas that are too narrow for rollers, like corners, ceiling lines, frames and skirting boards.

White paint being applied to a wall with a paint brush

3Seal the wall

Now, pour the sealer into your paint tray and apply to the wall with a roller. Once the wall is covered leave it to dry before painting. Now it's ready for painting.

White paint being applied to a wall with a paint roller
Health & Safety

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.