It restores the integrity of the chimney's flue liner so that hazardous gases (smoke, CO, etc.) are safely vented instead of leaking into the building. It addresses defects such as cracked clay tiles, spalled or eroded surfaces, gaps, holes, or failing mortar joints. It offers two main methods: 

• Joint repair — filling individual voids or defective mortar joints
• Resurfacing — applying a “liner coating” across the entire internal surface of the flue to re-seal it (“slip casting”)

The core material is a hybrid “Cerfractory” coating, which combines high-fired ceramic strength and refractory heat resistance.

When used with the CeCure Sleeve, the system is UL-1777 certified as a chimney liner (by Intertek).

The system exceeds the duty requirements of many building codes (IRC, NFPA) — it is rated as “Super-Duty” in testing.

For resurfacing, a custom foam plug is placed in the flue and is winched upward. A “tie coat” is applied first as a primer/cleaning layer, then the Cerfractory material is applied via slip­casting (pulled upward as the plug moves).

The entire interior surface is coated, so even small hidden cracks or porous spots are sealed.

After application, the repair is verified using camera inspection to ensure voids are sealed and there are no defects.