Sampling

When investigating paint failure, samples of paint flakes, blister liquid, and surface deposits/exudation are typically collected. Paint flakes can also be useful in cases where the original paint specification is unknown, as they can help determine the type of paint that needs to be applied for maintenance. Additionally, paint flakes can be used to measure the number of coats applied and the dry film thickness of individual layers in a coating system. Analysing paint flakes can also reveal faults or weaknesses in a coating system that may not be visible to the naked eye.

Collecting samples for laboratory analysis is crucial when investigating paint failure. The samples should be representative and have a traceable origin. It is important to carefully select sample locations that accurately reflect the faults or failures being investigated and to collect a sufficient number of samples to draw conclusions.

Photographs of the sample locations should be taken, including both a general overview to identify the sample location and close-up images before and after sample removal, with a ruler or other indicator of scale.

The Coatings Radar App provides guidance on the sampling techniques used in a coating survey.