Surface Professional Apprenticeship Career Track (SPACT) Test 3 Practice 2025 - Free SPACT Practice Questions and Study Guide

Blistering is a well-known defect that can occur during the coating application process. This issue arises when air or moisture becomes trapped beneath the applied coating, leading to an uneven surface appearance. As the coating dries and the trapped elements expand, they create bubbles or blisters. These blisters not only compromise the aesthetic quality of the finish but can also weaken the adhesion of the coating to the substrate, potentially leading to premature failure.

Understanding blistering is essential for anyone involved in coating applications, as it underscores the importance of proper surface preparation and environmental considerations, such as humidity and temperature, during the application process. By recognizing the conditions that lead to blistering, professionals can take proactive measures to prevent it, ensuring a smoother and more durable finish in their projects.