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.
- Protective gloves
- Mixer or drill with mixer
- Large container (measuring bucket)
- Wool roll with medium hairs
- Metal trowel
- Preparation of soil and smoothing product
- Application of the smoothing product on the floor
Preparation of soil and smoothing product
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.
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.
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
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.
5. Prepare and spread the dough on the ground as the implementation progresses.
6. Hold the trowel at an angle of 45° to help spread the smoothing compound.
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.
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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