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Make a smoothing plaster

Difficulty level:


Necessary tools:

Two knives to coat.
A flat file.
A stone to be sanded.
A paste smoothing coating.
A stepladder.
Fine sandpaper (200 grit).
A sanding block or an eccentric sander.
A broom.
A damp cloth.

Realizing a smoothing coating is involved in the preparation of a wall that must be painted or covered with wallpaper. This operation makes it possible to provide the walls or ceilings with the qualities necessary for the good adhesion of the coating:

Solidity, flatness and cleanliness.

The smoothing of a wall by plaster is important to obtain a good finish and good performance over time of the paint or wallpaper. This achievement is not required if your wall is in good condition. To make sure of the state of your support, consult our sheet prepare wall to be covered with paint or wallpaper.

Since the quality of the support conditions the final result, to coat a wall to smooth it requires to be careful and to work progressively and methodically.

Step 1: Prepare the knife to coat.

To properly coat a wall, it is necessary that your knife is slightly prepared in order to obtain a perfect smoothing.

As a first step, press the knife to coat on a wooden block so that you can hold it when sharpening. Pass a flat file on one side of the blade to bevel.

Make a smoothing plaster: plaster

Once you have beveled your knife, sharpen the blade with a sharpening stone by always passing it from top to bottom, so as not to damage the bevel.

Make a smoothing plaster: make

Step 2: Start the application of the coating.

Always work in small square areas 50 cm apart from the bottom.

Apply the plaster to spread 1 mm thick, do not hesitate to strongly press the blade, to distribute the coating evenly over the entire area.

Make a smoothing plaster: smoothing

Position the knife slightly at an angle, this will allow you to chase the coating outward and thus limit the different ironings.

Use another knife to reload your application knife, you will do a cleaner job.

Step 3: smooth the coating.

Once you have coated enough areas, you can start smoothing. For this, use the sharpened part of the blade facing the wall. Apply it at the top of the set of covered areas and vertically lower the knife.

Make a smoothing plaster: make

Advance in successive parallel strips, overlap the previous five-centimeter band, this will ensure a smooth and homogeneous surface.

Then again spread the plaster until you obtain another surface to smooth with the previous one and finally cover the entire wall.

Step 4: sand the plaster

Once the coating is dry (refer to the manufacturer's instructions), pass a very fine sanding paper (grain = 200) with a sanding block or with an eccentric sander.

Sanding your entire wall will make it perfectly smooth. Brush across the entire surface to remove as much dust as possible and finish with a damp, well-wrung cloth to remove the fine particles of plaster still stuck.

If your wall was in poor condition before coating, it is advisable to reapply a new layer, otherwise let it dry before going to the next stage to decorate it.

Wait 24 hours before covering your plaster, but do not hesitate to visit another of our sheets, like the one entitled painting an interior wall.

Video Instruction: How to Smooth Out Uneven Plaster With a Skim Coat