Follow this video guide to learn how to apply decorative plaster to an aerated concrete wall
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Plastering for the first time? Help is at hand! This specially designed video will take you step-by-step through all the stages of applying decorated plaster to your concrete wall, giving it a smooth finish.
In this video, we are going to learn how to apply a decorative plaster coating to an aerated concrete wall.
There are many benefits to having a wall made out of aerated concrete: it is light, easy to build on, it has very good insulating properties and is non-inflammable. Applying a decorative plaster coating will allow you to take full advantage of the wall's properties whilst giving the wall a attractive appearance.
Warning: This job takes a long time. Allow 2 or 3 days for each layer to dry.
To apply this decorative plaster, you will need: a bucket, a spatula, two coating knives, a flat paintbrush, a short-haired roller, a broom, a cloth, decorative plaster and decorative varnish.
There are three stages required for applying the decorative plaster coating, which we will describe to you in detail.
STAGE 1: Applying the first coat of decorative plaster
Before plastering the wall, apply a primer or spackle. To do this, refer to the video 'Applying a gap filler'. Once this first coating is dry, scratch off any rough bits and carefully sweep up the residue.
The wall is ready for you to apply the first layer of decorative plaster. Apply the coating in arched semi-circles, starting from the top of your wall. This movement will create nuances which will give the wall a daubed effect.
Carefully spread and remove any excess. If there is too much plaster, small lumps will appear. If this happens, you will need to scrape off the excess.
At this stage, the plaster coating does not need to be completely smooth: the strokes formed between the different strips will give the wall a daubed effect . The second layer however, will need to be smooth.
The appearance of stripes indicates that small stones or dry clumps of plaster are present. If this happens, remove them by hand and smooth the plaster coating over again.
STAGE 2: Applying a second layer of decorative plaster
Once the first layer is dry, apply the second.
This second layer should be applied from the top to the bottom, in semi-circles, exactly as you did the first time.
At this stage however, the plaster needs to be perfectly smooth and have no strokes between the strips.
STAGE 3: Applying the protective varnish
Once the second layer of plaster coating has been applied, buff the surface with a cloth.
The varnish needs to be spread with a short-haired roller, which is ideal for smooth surfaces.
Spread it from bottom to top, in vertical strips until your entire wall is varnished.
If some areas are still dry, it means there is not enough varnish there. Apply another layer with the roller if this is the case. If the varnish runs, it means there is too much. In this instance, spread it over a larger surface. Finish the edges with the brush.
Leave it to dry for the time indicated by the manufacturer.
You now know how to apply decorative plaster.