1. A product testing apparatus, comprising: a microscope having a microscopic imaging device configured to capture one or more images indicative of a sample having a cured substrate coating applied to a substrate; and at least one data processing system having a processor, one or more nontransitory processor readable medium, and processor executable instructions stored on the one or more non-transitory processor readable medium that when executed cause the processor to: receive the one or more images captured by the microscopic imaging device; process the one or more images by filtering lighting variations in the one or more images to identify one or more objects of interest in the cured substrate coating; quantify the one or more objects of interest; and generate a signal indicative of the quantification of the one or more objects of interest.