When masonry is slightly moist, often a restoration with KOSTER Restoration Plasters is enough to dry the wall and stop damage from occurring. KOSTER Restoration Plaster allows the masonry to dry without damage. KOSTER Restoration plasters are open to vapor diffusion and are hydrophobic. Salts remaining in the wall are absorbed by the KOSTER Restoration Plasters so that salt does not effloresce to the surface and cause damage to the plaster or paint. In this case, the old plaster must be removed from the wall and the joints raked out. All loose particles must be removed to provide a stable, absorptive, open-pored surface. Priming with KOSTER Polysil TG 500 prepares the masonry for the application of KOSTER Restoration Plaster. KOSTER Polysil TG 500 hardens the substrate and reduces the mobility of salts. Masonry repairs are carried out with KOSTER Repair Mortar Plus.
Before the application of the main plaster coat, a plaster key made from the chosen KOSTER Restoration Plaster mixed with KOSTER SB Bonding Emulsion is applied to provide a larger surface area and to ensure an optimal bond to the substrate.
KOSTER Restoration Plasters are available in different varieties (grey, white, fast and light). KOSTER Restoration Plaster White 3 is often used in older buildings without subsequent painting. KOSTER Restoration Plasters can only be painted over with breathable (open to vapor diffusion) paints such as KOSTER Silicone Paint White or KOSTER MF 1.
Always adhere to the specifications in the respective Technical Guidelines.