The success of a natural rendering depends not only on the product itself, but also - and above all - on the preparation of the substrate. Even the best coatings, such as Absolincan have its performance compromised if applied to an unsuitable or poorly prepared surface. For building professionals, this step is therefore essential to guarantee durability, adhesion and optimal aesthetics. Here are the steps and precautions to follow for impeccable application.
🔍 Initial diagnosis: knowing the substrate
Every project begins with a rigorous assessment of the wall:
- Type of substrate: brick, stone, concrete, plaster, raw earth, old plaster...
- General condition: cracks, damp, chalking, saltpetre, blistered paintwork...
- Compatible with lime, linen and marble powder-based plaster.
👉 This diagnosis determines the need for cleaning, stripping or pre-treatment.
🧼 Deep cleaning and dusting
A dirty or greasy substrate compromises plaster adhesion:
- Dust removal with brush or vacuum cleaner;
- Removal of organic residues, mold, grease or flaking paint;
- If necessary, gentle thermal or chemical stripping (not recommended on porous materials).
👉 A dry, clean, sound substrate is imperative before any application.
💧 Check for moisture and treat if necessary
Natural plaster is permeable to water vapour, but does not tolerate excessive substrate humidity:
- Use a humidity tester if in doubt;
- Treat causes: leaks, capillary rise, condensation, ventilation faults;
- In some cases, a lime finish can be applied as a breathable barrier.
👉 Never coat a wall that is still damp, as this may lead to bubbling, blistering or delamination.
🛠 Uniform absorption with a natural underlay
Depending on the nature of the substrate, it may be necessary to apply :
- A lime-based bonding slip;
- A water-based fixative for excessively absorbent surfaces;
- A bonding bridge compatible with smooth or closed surfaces (smooth concrete, tiles).
👉 This avoids differences in hue or texture due to irregular absorption.
🧱 Repair or correct structural defects
Before plastering, correct any visible imperfections:
- Structural cracks: open and fill with flexible mortar;
- Holes, chips, defects: level with a compatible filler;
- Angles, edges: check and adjust if necessary.
👉 The more even the base, the better and longer-lasting the final result.
📅 Respect drying and application times
Once the stand is ready :
- Allow 24 to 48 hours for drying between preparatory steps and application;
- Protect the wall frommoisture, strong wind or direct sunlight;
- Prepare the site to avoid interruptions during installation.
👉 A good substrate = 50% of the work done for a quality natural coating.
Properly preparing a substrate before applying a natural coating such as Absolin ensures the durability of your work, customer satisfaction and enhances the value of your expertise. This technical but essential step makes all the difference between an ordinary wall and a top-of-the-range, long-lasting finish that blends in perfectly with the building.
For professionals, it's the basis for a controlled worksite that respects both the material and the architecture.