Substrate type
Walls made of bricks, ceramic and silicate blocks, cellular concrete blocks, as well as walls and ceilings made of prefabricated concrete components. Old, not weathered cement-lime plasterwork, ALPOL AT 303 underlay plaster.
Substrate preparation
The substrate must be clean, sound, dry and free from dust and greasy spots. Remove paint coats from old and durable plasters, patch irregularities and chipped plaster with ALPOL AZ 130 quick-setting mortar or ALPOL AZ 135 levelling mortar. Walls made of cellular concrete as well as of silicate bricks and blocks require neither priming nor an initial scratch coat. Before plaster application, moisten the walls with plenty of water. For other substrates, apply an initial scratch coat with ALPOL AT 303 underlay plaster or use ALPOL AG 702 primer. Surfaces exposed to scratching, e.g. adjacent structural material, corners of door/window openings etc., should be strengthened with 10 mm fibre-glass reinforcing mesh, by embedding it in ALPOL AZ 130 quick-setting mortar or ALPOL AZ 135 levelling mortar.