It is a high temperature cement for collecting and repairing new and worn catalysts and exhaust systems. It is also used for sealing leaks and cracks. Mefix is a hotbed. It is easy to apply on the surface and does not shrink, And does not crack during hardening. Another feature to be mentioned is that it is water resistant. Useage: First remove rust, grease, and other contaminants from the surface to be repaired. Then apply a little water to the cement. When assembling new parts, apply cement on both surfaces to joined. When sealing the worn parts, seal the leaks and cracks. When finished, start the engine and let it run ant low revs for 20minutes. Full reifnorcement is achieved within 24hours.