GlueWise
More material pairs

Material pair

Ceramic to Ceramic

Best bet

2-part epoxy

Fills the hairline gaps in a clean break and survives hot water.

Preparation

Prep each side differently

Ceramic

Wash both broken edges and let them dry completely; unglazed faces just need dusting.

Ceramic

Wash both broken edges and let them dry completely; unglazed faces just need dusting.

Conditions

When the answer changes

If the joint will be submerged or flex, use 100% silicone and accept a softer bond. Nothing common is food-safe at the lip of a mug — keep glued repairs away from the rim, or retire the piece to decorative duty.