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Picture of How to Repair a Crack in Broken Pottery or Ceramic Vessel

How to Repair a Long Hairline Crack on Ceramic and Pottery with Strong Mechanical Integrity
When a ceramic vessel has a long hairline crack, typically, it is required to be broken completly before repair for proper reapir access. When the hairline crack goes through design details and breaking it will increase the required repair areas, the "pegging" method illustrated below can be used. The pegging technique ceramic repair requires the walls of the vessel to be thick enough to accept a peg. When pegging is done properly, it is an excellent way to restore durability to the repaired ceramic item with a hairline crack prior to continuing the restoration process. Below, we repair a cracked jar with some step by step illustrations and explanation. To see examples of a cracked bowl, cracked mug, cracked plate, cracked vase, cracked urn or a cracked jag, see our restoration examples page.

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Step 1: The crack and grinding for peg insertion

Picture of The crack and grinding for peg insertion
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Choose to grind the channels on the side with less details. In this example, we used a 5mm diamond rotary disk to create a channels across the crack to embed the peg. We also created a channel along the crack to allow the clear epoxy to pool so that it can penetrate through the crack's wall.