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I bought an old building that has never been serviced. There was some water infiltration, they were repaired, the walls are dry but when painted, halos emerge from some walls. These walls for some are coated with lime and others of lime more plaster.

Lime and plaster are sensitive to moisture. Plaster, unlike lime does not "breathe" and is watery: the halos must be more present on the plastered areas. Before any painting work, the walls must be properly dried. Install a professional electric dehumidifier in the affected rooms to completely dry the walls. Check that the plaster is not powdery. If it is, apply a hardener if necessary. In the case of walls that are difficult to prepare, the glass fabric is a powerful solution. Its pose is similar to that of thick coatings.

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