The new lighthouse, which sits right next to the old one, was inaugurated in August 1978: a cylindrical tower in concrete characterised by its red and white horizontal stripes with an automatic beacon set at 39 metres above the ground.
Two years ago, after realising the extent of the damage due to its constant exposure to atmospheric agents and the level of corrosion caused by the marine aerosol, the port authorities decided to restore the lighthouse.
The first step was to remove all the damaged and deteriorated concrete from the surface of the tower with power tools until the steel reinforcement was exposed. It was recommended to passivate the reinforcement with two coats of MAPEFER 1K protective cementitious mortar.
Once the MAPEFER 1K was dry, the surface of the tower was restored with the thixotropic mortar MAPEGROUT T40,
which is easy to apply in thick layers on vertical surfaces without using formwork, mixed with MAPECURE SRA 25 (this product has now been replaced in Spain with MAPECURE SRA). On some of the smaller areas, on the other hand, PLANITOP SMOOTH & REPAIR fibre-reinforced, thixotropic cementitious mortar was applied.
The entire surface was then treated with MALECH micronized acrylic resin-based primer in water dispersion. This product was used to even out the absorbency of the substrate and as an adhesion promoter for the paint to be applied afterwards. For the final painting cycle, Mapei Technical Services recommended applying SILEXCOLOR PRIMER and, once it was completely dry, it was then finished off with SILEXCOLOR PAINT, a silicate-based coating product permeable to vapour which is available in a wide range of colours.
For further information see www.mapei.es