Glossary

Formation of cracks

Where cracks run parallel to the wood fibres or glue or structure joints such as parapet joints, etc., then the substrate needs to be looked at for the cause of the cracks forming. Cracks forming a web under the surface normally involve cracks in the lacquer, which either originate from the composition of the lacquer or from coatings being too thick. In this way, for example, NC buffing lacquer can lead to cracks forming with layers that are too thick, just as with AC lacquer applied with too high a proportion of hardener. Where there is doubt about the formation of cracks, then the lacquer in question can be sprayed at the corresponding thickness onto a glass slide, which behaves completely neutrally, to be studied after drying for the formation of cracks

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