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The right productAmong the wide range of filling and smoothing coatings, the best suited must be selected. You will have the choice between ready-to-use products, presented in the form of paste, and powder coatings which must be mixed in water, more economical.
Identify cracksWe must distinguish different types of cracks. The finest are due to defects in the plaster coating or the play of materials. They are stable and do not reappear once clogged. On the other hand, living cracks, due to the dimensional variations of the materials, which affect the entire thickness of the plaster and sometimes even the entire thickness of the wall, threaten to reappear and must receive special treatment, in this case a stabilizer.
Tools & materials• Painter's knife
Trough to spoil
Filling plaster paste (tube or jar) and powder
Powder or paste?The coating, filling or smoothing, presented in powder form is more economical. It is best suited for large areas, large filling jobs and smoothing. Spoil it in a trough, respecting the proportions recommended by the manufacturer, and take care to mix well in order to obtain a homogeneous dough. Dough plasters have the advantage of avoiding preparation time and of presenting a perfect dosage, without risk of mixing error.
Other coatings• The fatty coating is used to fill holes and cracks both inside and outside. It leaves a hard, waterproof and relatively difficult to sand surface. Indoors, it must be reserved for places exposed to humidity.
The lacquer coating is a particularly fine smoothing coating, which leaves a clean and flat surface, for a smooth finish like a mirror with a glycerophthalic lacquer. Prefer coatings to be lacquered in paste because the dosage of the product is of great importance for the success of the operation.