Functional evaluation of varnishes used in spray coating of electronic equipment

During the war the Armed Services experienced a high rate of failure of electronic equipment in tropical service. Upon examination, much of this equipment was found to be covered with fungus growth. It was recognized that this fungus growth occurred at high humidity. The direct contribution of moisture itself to the failure of electronic equipment was often overlooked and fungus growth alone was blamed for the field failures. In consequence, methods of combating fungus growth in electronic equipment were sought.