Thermo-resistant sealing compound for candle moulds.
Who hasn't experienced the situation where you pour the hot wax into the candle mould and at the bottom of the wick, the wax runs out of the mould again. You can't tie a knot that thick.
With this modelling clay, sealing the wick hole is no longer a problem.
The mass is also very economical and can be used again and again.