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Smoothing a floor with a smoothing compound

Smoothing (or patching) coatings help to make new or old substrates smooth and smooth. Ready to use and self-leveling, they are easy to apply and form a homogeneous surface ready to receive a glued floor or not. Their thickness can vary from 1 to 30 mm in one or two passes depending on the formulation of the plaster and the flatness of the floor. They are intended for indoors and / or outdoors. They must be covered with a coating or floor paint, unless otherwise specified.

Necessary material

  • Protective gloves
  • Mixer or drill with mixer
  • Large container (measuring bucket)
  • Wool roll with medium hairs
  • Metal trowel
  • burin
  • Trowel
  • Vacuum

Steps

  1. Preparation of soil and smoothing product
  2. Application of the smoothing product on the floor

Preparation of soil and smoothing product

Repair holes by quenching with quick mortar

Repair holes by quenching with quick mortar

1. The soil must be prepared carefully, a degraded or unprepared support is at the root of many problems (unevenness, delamination, premature wear of the coating, etc.). Remove traces of plaster, glue or paint by scraping or sanding. Repair the holes by scraping the friable parts. Dust the floor with the vacuum cleaner. First dampen the holes before resealing them with a quick mortar.

Apply a primer to the plaster before smoothing

Apply a primer to the plaster before smoothing

2. Apply a bonding primer to obtain good adhesion between the smoothing compound and the substrate. Pour the primer on the floor. Spread it with a medium-haired woolen roll or a wide brush. Let it dry for 1 hour on an absorbent support and 2 hours on an impermeable support before applying the floor coating.

Attach a mixer and mix until you get a smooth smoothing paste

Attach a mixer and mix until you get a smooth smoothing paste

3. Prepare the smoothing compound by first pouring the water into a large container and then the powder. It is imperative to respect the quantities indicated on the instructions for use. Attach a mixer to a drill set at 500 rpm and mix until a smooth paste is obtained.

Application of the smoothing product on the floor

Spread the smoothing compound with a metal trowel

Spread the smoothing compound with a metal trowel

4. The soil will then be worked in small areas of 1 to 2 m2. Spread the product using a metal trowel. Proceed with wide back and forth movements (type wiper blades). The dough can not be used after about 20 minutes.

Spread the smoothing paste on the floor

Spread the smoothing paste on the floor

5. Prepare and spread the dough on the ground as the implementation progresses.

Tilt the trowel at 45° to promote the spreading of the smoothing plaster

Tilt the trowel at 45° to promote the spreading of the smoothing plaster

6. Hold the trowel at an angle of 45° to help spread the smoothing compound.

Adjust the desired thickness of the smoother with the trowel

Adjust the desired thickness of the smoother with the trowel

7. Adjust the desired thickness, minimizing the angle of the trowel and keeping it almost horizontal when moving back. The coating, thanks to its self-leveling power, will equalize itself.

Let the coating dry for 5 hours before you can walk

Let the coating dry for 5 hours before you can walk

8. Allow 5 hours to dry before being able to walk on the floor and between 24 to 72 hours to install a floor covering, depending on its nature. The average coating consumption is 1.5 kg of powder / mm thick / m².

(photos / visuals: © Bostik, except special mention)

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