Cobwebbing is a type of coating defect experienced on metal surfaces after the application of a coating intended to prevent corrosion. Cobwebbing presents itself as small strands of scattered resin residue on a metal’s surface.
The occurrence of cobwebbing prevents adequate corrosion protection of a metallic surface because the surface is exposed to external corrosion agents that can gain entry via formed holes in the cobweb coating structure.
Cobwebbing appears as a spiderweb-like connection of strings. It is caused by inadequate application of the coating when it begins to dry before it makes contact with the metal's surface.
Cobwebbing can be prevented by careful timing of the coating application, reducing the system application pressure and by using a lower-density coating.
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