Common issues in industrial paint spraying include sagging, pinholes, blistering, and orange peel. These problems are typically caused by application techniques, environmental conditions, or incorrect paint ratios. Understanding the root causes and solutions helps improve coating quality.
Sagging: Uneven coating caused by paint flowing downward on vertical surfaces. Causes include low viscosity, excessive application thickness in a single coat, or slow evaporation of the thinner. Solutions involve adjusting viscosity, controlling layer thickness per coat, and selecting an appropriate thinner.
Pinholes: Small holes on the coating surface. Causes include air trapped in the paint, oil or moisture on the substrate, or rapid drying of the coating. Solutions: stir the paint thoroughly, ensure the substrate is clean and dry, and control environmental conditions during application.
Bubbling: Bubbles appear on the coating surface. Causes include moisture or solvent residue on the substrate, air entrapment during mixing, and excessive coating thickness. Solutions: ensure the substrate is dry, allow the paint to stand and degas before application, and apply multiple thin coats.
Chalking: A white, hazy film appears on the coating surface. Causes include high humidity during application, excessive water content in the thinner, or incompatibility between the paint and thinner. Solutions involve controlling environmental humidity, using certified thinners, and ensuring paint-thinner compatibility.
Poor Adhesion: Weak bonding between the coating and substrate, leading to peeling. Causes include inadequate surface preparation, improper primer selection, or excessive intercoat intervals. Solution: Follow standard surface preparation procedures, select the appropriate primer, and control intercoat timing.
CASUL provides comprehensive construction technical guidance to help you resolve any coating issues and ensure high-quality finish results.