Surface preparation

Preparing the surface for a perfect installation
August 25, 2023 by
Pauline Balbeur

Properly preparing the surface is a crucial first step towards the success of your installation project. Careful preparation creates a solid base for the application of waxed concrete, ensuring optimal adhesion and a flawless finish. By thoroughly cleaning, leveling and removing any dirt, moisture or blemishes, you create an environment conducive for the coating to adhere and achieve the desired aesthetic result. Meticulous surface preparation is key to ensuring that your installation not only looks great, but is also durable and resistant to the challenges of time.

The waxed concrete is applied in two thin layers, it does not hide the imperfections of your surface, but marries them. Thus, if the surface has irregularities or imperfections, they will show through the waxed concrete. This is why it is essential to prepare the surface by making it smooth and free from any defect before applying the waxed concrete. This makes it possible to obtain an aesthetic and uniform result once the waxed concrete has been applied. 

If the surface is not smooth, imperfections can compromise the adhesion and appearance of the waxed concrete. It is therefore recommended to carry out a leveling and an adequate preparation of the surface before the application of the waxed concrete.

If the surface to be coated has significant defects, the required repair work must be carried out. For holes and cracks, you can get the filling paste.

No, the surfaces to be coated must be solid, sound, crack-free, degreased, clean, dry and dust-free. If the surface has pre-existing defects, the coating will not hide them.

If the wall is covered with wallpaper, it must be completely removed, the wall cleaned and prepared to be uniform.

Can I apply waxed concrete filler directly to a gypsum surface with the seams pulled, or do I have to use a primer?

Silex element always recommends using a primer coat first. This establishes a solid adhesive base between the gypsum surface and the waxed concrete coating, thus ensuring better hold and durability of the coating. The primer also helps to even out the absorption of the surface, thus facilitating an even application of the waxed concrete coating.

Especially for new walls, the application of a primer is necessary. Recent construction materials, such as gypsum, may have a porous surface or exhibit variations in absorption. The primer seals the surface, thus reducing the risk of detachment or the formation of air bubbles, while promoting a smooth and homogeneous finish during the application of the waxed concrete coating.

By following this general recommendation to apply a primer, you increase your chances of obtaining an aesthetic and lasting result when applying the microcement plaster on a gypsum surface with the joints drawn. 

Order your Silex Primer here

When a concrete slab has just been poured, it requires a minimum of 3 weeks to dry properly 

Lifting of waxed concrete can be linked to several factors, including trapped moisture

Here are some considerations to take into account:

  1. Proper drying: After laying, it is important to wait at least three weeks to allow the concrete slab to dry completely. If this period has not been respected, the waxed concrete could lift.
  2. Inspection of infiltrations: Check if there are areas where water could seep under the waxed concrete. Water infiltration can cause the material to lift. Locate and eliminate any source of moisture.
  3. Proper Application: If the application instructions in the guide have been followed exactly and there is no moisture problem below the surface, heaving should not occur. Make sure that every step, from preparation to application, has been carried out with precision.

In summary, although the lifting of waxed concrete is not the norm, it can be avoided by respecting the drying periods and by eliminating the sources of moisture. If problems persist, consider consulting a professional for further evaluation and suitable solutions.