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Impurities such as oil, wax, varnish or paint residues are not allowed as they affect the solid bonding of levelling compounds and floorcovering adhesives and therefore the entire floorcovering work. Oil and wax can often only be removed by milling or sand blasting the subfloor. Removal of impurities and construction residues on the surface of the subfloor lies within the responsibility of the installation company.
Impurities on the surface of the subfloor, e.g. oil, wax, varnish or paint residues:

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