Powder Coating Troubleshooting: Pinholes (Foaming)

We are introducing measures to address issues such as the residue of oils and other substances on the surface of coated items caused by poor degreasing!

This is a phenomenon where tiny holes appear on the surface of the paint film, resembling being poked with a needle, known as "pinholes (foaming)." We will introduce troubleshooting for this issue. If the cause is foaming from porous substrates, such as castings, zinc-plated materials, or aluminum die casts that have pinholes, it is possible to take measures by pre-baking the substrate or applying a solvent or powder primer before painting. Additionally, there are countermeasures for issues caused by the adhesion of foreign substances such as rust and dirt, or the residual oil on the substrate surface due to inadequate degreasing. [Causes and Countermeasures (Excerpt)] ■ Due to the adhesion of foreign substances such as rust and dirt → Thoroughly remove foreign substances ■ Due to air being trapped in the paint film → Check the temperature rise curve and slow down the temperature increase as much as possible ■ Due to residual oil on the substrate surface from inadequate degreasing → Strictly manage the concentration, temperature, spray pressure, and processing time of the degreasing agent *For more details, please refer to the PDF document or feel free to contact us.

paint