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Blistering: bubbles under or within the coating
Dome-shaped bubbles in the film, often caused by contamination trapped under the coating that draws in water.
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Coating defect library
Name it. Find the cause. Stop it recurring.
The defects we see most often, what causes them and how to prevent them. Every one has a root cause, and it is often earlier in the process than you think.
Application
Cissing and cratering: coating that will not wet the surface
Round craters or bare patches where the coating has pulled away from a contaminated spot.
ReadSurface preparation
Flash rust and rust spotting
A light orange haze on freshly prepared steel, or rust spots breaking through a finished coating.
ReadCuring
Mud cracking: a crazed pattern like dried mud
A network of cracks like a dried riverbed, most often in zinc-rich primers applied too thickly.
ReadApplication
Orange peel: a dimpled, uneven finish
A dimpled surface like the skin of an orange, caused when the coating cannot flow out before it sets.
ReadApplication
Pinholing: tiny holes that let corrosion in
Minute holes through the film, often invisible to the eye, that give moisture a direct path to the steel.
ReadSurface preparation
Poor adhesion and delamination
Coating that lifts from the steel or separates between coats, usually because of what happened before it was applied.
ReadApplication
Runs and sags: coating that flows downhill
Wet coating that slides down a vertical surface under its own weight, leaving thick lips and thin areas above.
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Seeing a defect you cannot explain?
Send us photos with the enquiry form. We can often tell you the likely causes straight away, and what a site visit needs to check.
Prefer to talk? Call 07810 022184