Definition - What does Solvent Popping mean?
Solvent popping is a coating defect that occurs when the coating solvent begins to evaporate after the coating has been applied. The solvent turns into a gas during evaporation and is trapped underneath the coating surface because the surface has already solidified. Solvent popping is visible on the exterior surface of the coating in the form of small bubbles.
Solvent popping is a defect because it can cause coating failure. The bubbles left on the surface of the coating can reduce the adhesive strength of the coating, causing the coating to fall off, leaving the base material exposed and subject to corrosion. Solvent popping is also considered a defect because it is not aesthetically pleasing.
Corrosionpedia explains Solvent Popping
Solvent popping is a defect that is common with many different types of coatings. The solvent, which is the liquid media that is used during the application of the coating, is supposed to evaporate and leave a hardened, durable coating. However, solvent popping can occur if the solvent isn’t allowed to escape once it becomes a gas. Causes of solvent entrapment include using a paint that is too thick or an incorrect solvent.
Several actions can be taken if solvent popping occurs. If the coating is still wet, then a solvent may be applied again to remove the coating so that another attempt can be made. If the coating has already hardened, than it may be necessary to sandblast or use another means of coating removal to permit another attempt to coat the base material.