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Role of Moisture in the Failure of Coatings on Wood

Biological Systems Engineering, University of Wisconsin, 4510 Gregg Road, Madison, WI 53705, USA
Accsys Group, P.O. Box 2147, NL-6802 CC Arnhem, The Netherlands
Author to whom correspondence should be addressed.
Academic Editor: Mojgan Nejad
Coatings 2017, 7(12), 219;
Received: 14 September 2017 / Revised: 27 November 2017 / Accepted: 27 November 2017 / Published: 2 December 2017
(This article belongs to the Special Issue Wood Coatings)
PDF [5350 KB, uploaded 2 December 2017]


Most wood coating tests are done either in a short term artificial weathering chamber or long term on an outdoor rack/fence. In both cases, the coatings are exposed to both ultraviolet radiation and water. This study is focused on the influence of moisture alone on wood opaque film forming coating failures. As moisture is sorbed into the wood structure, the wood swells in proportion to the volume of water sorbed. As moisture is lost, the wood shrinks in proportion to the volume of the water lost. Moisture in the wood end grain is responsible for coating failure in, for example, window corners and end to end siding. The wood cell wall moisture can be greatly reduced by a process known as acetylation which not only reduces the moisture sorbed in the cell wall but results in high levels of dimensional stability. The reduced moisture uptake along with the stability results in less stress created between the coating wood surface interface improving the performance of the coating and increasing its useful lifetime. View Full-Text
Keywords: moisture sorption; cell wall; acetylation; wood; coating; dimensional stability; coating failure moisture sorption; cell wall; acetylation; wood; coating; dimensional stability; coating failure

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Rowell, R.; Bongers, F. Role of Moisture in the Failure of Coatings on Wood. Coatings 2017, 7, 219.

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