Issues and Measures in the Coating Process

Runs and bubbles from thick films and close spraying

Blushing and whitening from humidity and thinner

Metallic mottling from poor pigment orientation

Touch-dry is not the same as shipment-ready

Check workpiece temperature in the oven

Setting time: too short or too long causes defects

Control air, exhaust and solvent vapor in the oven

Moisture and oil cause nibs and clogging in powder coating

How pinholes and foaming occur inside films

Lifting caused by topcoat solvent

Do not repair without knowing the old coating

Coating becomes tacky again after drying

Film swelling caused by moisture

Color migration from the substrate

Yellowing and fading are not judged by initial color alone

Cloudiness and chalking signal surface degradation

Protect quality through packaging, storage and transport

On-site interview checklist for coating-process troubles