What is blistering in paint?

Blistering in paint refers to the formation of bubbles or blisters on the surface, typically caused by moisture or solvent vapor being trapped under the film of paint. This can occur when there are issues with the application or preparation, such as using too much thinner, leading to improper film formation.

In this context, too much thinner can lead to rapid evaporation and incomplete drying, which allows moisture or solvents to escape and create blisters. Therefore, this option directly correlates with the phenomenon of blistering, as a high thinner content compromises the integrity of the paint film, making it susceptible to blistering.

While other factors like quick evaporation or improper primer application can also contribute to paint issues, they do not specifically define blistering as precisely as the condition caused by excessive thinner. Dust settling on wet paint could disrupt the surface but does not cause blistering.