Renewing old façade coatings

Until recently, to renovate coated façades with coarse acrylic mortars, glass plates or rough paintwork, it was necessary to completely remove the old coating before applying a new one.

Using the hydraulic mortar PROPAM® RENOVACIÓN allows a fine coating to be applied to the surface of the substrate, which helps to repair any flaking and smooth the old render, without having to remove it.

Then an acrylic coating (REVAT® FILM, REVAT® PLAS) or limestone stucco (REVAT® CAL ESTUCO, REVAT® CAL FINO) can be applied as a new render finish.

Solution

ANTIQUE RUGGED PAINT COATINGS

Check the adhesion to the old coating support, eliminating by chemical pickling, hot pickling or peeling the degraded parts or in poor condition. In the particular case of granulite, its complete elimination is recommended.

Wash the entire surface with acidic water to open the porosity in the support. Rinse afterwards with plenty of clean water.

Apply PROPAM® RENOVACIÓN in a maximum thickness of 2 to 3 mm (per layer) in the areas where the old coating has been removed. Apply if necessary on old paint in good condition.

Apply REVAT® FILM or REVAT® PLAS to make the final finish of the facade with an acrylic coating.

Apply REVAT® CAL ESTUCO o REVAT® CAL FINO to make the final finish of the facade with a lime stucco. Protect with REVAT® PROTEC ORG.

OLD VITREA PLATELET COVERINGS

Check with rubber mallet the adhesion to the support of the old vitreous plate coating. Remove badly adhering areas.

Wash the entire surface with acidulated water to open the porosity. Rinse afterwards with plenty of clean water.

Apply PROPAM® RENOVACIÓN in areas where the vitreous plaque has been removed. Then apply PROPAM® RENOVACIÓN in a layer of thickness of 2 to 3 mm (per layer) on the entire surface to be coated with the new coating.

Apply REVAT® FILM o REVAT® PLAS to make the final finish of the facade with an acrylic coating.

Apply REVAT® CAL ESTUCO or REVAT® CAL FINO to make the final finish of the facade with a lime stucco. Protect with REVAT® PROTEC ORG.

Recommendations

In the case of painted façades, apply PROPAM® DUR to achieve a uniform and homogeneous behavior of the support.
Depending on the condition of the support and especially on vitreous platelet supports, it is recommended to apply PROPAM® AISTERM MALLA DE FIBRA DE VIDRIO 160 when the pasta is still fresh. It is necessary to ensure a minimum overlap of 10 cm in the encounter with the following mesh in order to obtain a good final finish, it is recommended to give a second layer of smoothing and later to perform its dewatering.