Conflicting data may be obtained from accelerated laboratory tests vs. long-term exterior exposures when determining the fungal resistance of organic paint films. Similar imbroglio has resulted from other accelerated testing of paint failure, i.e., salt fog testing for corrosion, adhesion on galvanized steel, and UV light resistance of paints and plastics. This article discusses the trials and tribulations of one individual who realized the almost complete reversal of data from accelerated tests vs. long-term exterior exposure for determining fungal resistance of paint films. He broke from the traditions of a typical microbiologist who depended on accelerated tests and resorted to more realistic long-term exterior exposures and arrived at a prized conclusion. Caution is suggested when extrapolating data from accelerated laboratory tests to form conclusions regarding long-term exposures.
The public is recognizing the roll that microorganisms play in making a house “sick.” People complain they are becoming sick from microbes in homes, factories, police stations, etc. It is timely that the standard accelerated tests involving microorganism control on organic films be reviewed. Such accelerated data may have limited value in extrapolating to both interior and exterior exposures. In a worst-case scenario, interpretation of accelerated data may lead to conclusions and long-term decisions that are completely opposite and erroneous.