Pyrolite E-Z Fill Adhesive
Available in a 10 oz. tube, Pyrolite E-Z FILL Adhesive is a high-temperature joint and repair product for use where direct molten metal contact is not required.
Some more handy info from the manufacturer of Pyrolite:
Surfaces to be bonded must be clean and free of loose particles, dust and release coating. Curing takes place through normal air drying. Low temperature heat (up to 200°F or 95°C) can be used to accelerate the process, if necessary. This can be accomplished using a hot air blower or low velocity flame.
The product should be stored between 40°F (4°C) and 90°F (32°C). Under these conditions, the normal shelf life is one year. In temperature and humidity controlled storage, a shelf life of two + years may be expected. It can be used in environments up to 2300°F or 1260°C.