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Journal article Open Access

Bioinspired Living Coating System in Service: Evaluation of the Wood Protected with Biofinish during One-Year Natural Weathering

Faksawat Poohphajai; Jakub Sandak; Michael Sailer; Lauri Rautkari; Tiina Belt; Anna Sandak


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    "doi": "10.3390/coatings11060701", 
    "description": "<p>The service life performance of timber products exposed to natural weathering is a critical factor limiting the broad use of wood as an external building element. The goal of this study was to investigate the in-service characterization of an innovative biofinish coating system. It is a novel surface finishing solution based on the bioinspired concept of living fungal cells designed for effective wood protection. The performance of Scots pine (Pinus sylvestris&nbsp;L.) wood coated with biofinish was compared with uncoated references. Samples were exposed to natural weathering for 12 months under the climatic conditions of northern Italy. The visual appearance, colour, gloss, wettability, and 3D surface topography of the wood surface were examined. Results revealed that the total colour changes (\u2206E) of biofinish-coated wood were negligible. Untreated Scots pine wood revealed the changes in colour after just three months of exposure. The gloss changes of both surface types were small. The contact angle measured on biofinish-coated wood was higher compared to that of uncoated Scots pine. Surface roughness increased in uncoated wood due to the erosion effect caused by the weathering progress. Conversely, the surface roughness of biofinish-coated samples decreased along the exposure time. This phenomenon was explained by two self-healing mechanisms: migration of non-polymerized oil to the cracked surface, where it polymerizes and creates a closed layer, and local regrowth to cover damaged spots by living fungal cells present in the coating. The obtained results revealed the superior aesthetic performance of the biofinish surface treatment against natural weathering. By considering the fully bio-based nature of the investigated coating, it was concluded that this solution can be an attractive alternative for state-of-the-art wood protection technologies.</p>", 
    "alternate_identifiers": [
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        "identifier": "2079-6412"
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    "title": "Bioinspired Living Coating System in Service: Evaluation of the Wood Protected with Biofinish during One-Year Natural Weathering", 
    "license": {
      "id": "CC-BY-4.0"
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    "journal": {
      "volume": "11", 
      "issue": "6", 
      "title": "Coatings"
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        "title": "Renewable materials and healthy environments research and innovation centre of excellence", 
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    "keywords": [
      "natural weathering", 
      "bio-based coating", 
      "service life performance", 
      "aesthetics", 
      "living fungal cells", 
      "bioinspired materials design"
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    "publication_date": "2021-06-11", 
    "creators": [
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        "affiliation": "InnoRenew CoE; Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University", 
        "name": "Faksawat Poohphajai"
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      {
        "affiliation": "InnoRenew CoE; Andrej Maru\u0161i\u010d Institute, University of Primorska", 
        "name": "Jakub Sandak"
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      {
        "affiliation": "Xylotrade B.V", 
        "name": "Michael Sailer"
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        "orcid": "0000-0002-1207-220X", 
        "affiliation": "Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University", 
        "name": "Lauri Rautkari"
      }, 
      {
        "affiliation": "Production Systems, Natural Resources Institute Finland (Luke)", 
        "name": "Tiina Belt"
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      {
        "orcid": "0000-0002-2515-0991", 
        "affiliation": "InnoRenew CoE; Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska", 
        "name": "Anna Sandak"
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