The influence of wood properties on cracking, blistering, and flaking of a 3-layer acrylic coating system was investigated in a natural weathering test from autumn 2007 to spring 2011. The performance of the coating was mainly reduced in the lowest third of the test samples. The origin of the samples in terms of vertical stem position did not have an influence on the performance of the coating. The coating system exhibited less cracking and blistering on samples with standing year rings, i.e., quarter-sawn boards with growth rings running parallel with the narrow sides of the board. Blistering was most severe on samples where the pith side was coated.
Keywords: cladding, coating, natural weathering, outdoor exposure, service-life
Authors
Hundhausen U.
Norwegian Institute of Wood Technology (TRETEKNISK), Oslo
Jacobsen B.
Norwegian Institute of Wood Technology (TRETEKNISK), Oslo
Damm M.
Norwegian Institute of Wood Technology (TRETEKNISK), Oslo
Engebretsen S.
Norwegian Institute of Wood Technology (TRETEKNISK), Oslo
Fjelde S.
Jotun A/S, Sandefjord
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