To repair a humidity-affected wall, first sanitize it, says decorator

Addressing humidity damage on walls requires a rigorous technical process, not just quick fixes, according to interior designer Abel de González. He emphasizes that the key to a successful repair lies in proper sanitation, sealing, and finishing, as detailed in his explanatory video.

González stresses the importance of first ensuring the original water leak is completely resolved and the wall surface is thoroughly dry. The sanitation phase involves mechanically removing all degraded material, such as loose paint, cracks, or damaged sections, using a spatula. He cautions against over-removal to avoid exacerbating the problem, stating that meticulous cleaning is essential to prevent the humidity from reappearing after repainting.

Following sanitation and confirmation of dryness, the next critical step is priming. González recommends using oil-based sealants to create an insulating barrier that stops stains from resurfacing. He warns that skipping this step will inevitably lead to the stains returning. A quality sealant is vital for compacting the wall and preparing a suitable surface for subsequent treatments.

For filling imperfections, González distinguishes between damage types. While traditional plaster (escayola) is suitable for larger patches due to its load-bearing capacity and low shrinkage, modern ready-to-use fillers are also available. He advises applying filler in two coats: the first to uniformly cover holes, followed by sanding once dry. A second application ensures a smooth finish before painting. The final stage involves applying a water-based fixative to ensure paint adhesion, as filler patches absorb paint differently than the original wall, which can cause tonal variations or shadows. He also suggests a homemade fixative by mixing white plastic paint.

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Si no se le aplica nada, la mancha de humedad siempre va a volver a salir