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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

Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions that came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings Team Member.

Grave health hazards are linked to asbestos, which may be in homes built up to 1990. Health hazards may result from exposure to lead-based paints in older materials and copper chromium arsenic (CCA) treated timber. 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.