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.
Step 1: The Crack and Grinding for Peg Insertion
Step 2: Copper Peg Preparation for Cementing
Step 3: The Cementing Process
Step 4: The Cementing Process - Two Part Clear Epoxy
Step 5: Filling in and Covering Repair Lines
Step 6: Paint and Cold Glazing
If the glued seam shows or the filler is visible and this is not acceptable to you, color touch up is required and is not covered here due to numerous possibilities and the complexity of it. We use high end acrylic paints or coloring pigments powders and colored hardeners mixed with proper additives to create strength and the right light reflection to emulate the broken item's glaze affect as close as possible - see our tools and materials tutorial page. Note that this is the most difficult part to master and it is very time consuming especially when repairing objects with multiple colors.