Замазать печь, раствор не дающий трещин.

A super recipe for a crack-resistant stove grout. Ingredients: I used 1 liter of clay, 3 liters of sifted wood ash, and 600g of coarse salt. I pre-soaked the clay, sifted the ash, and then poured boiling water over it. Next, I mixed the ash, clay, and salt thoroughly and left it for three hours. Then I grouted the stove. The grout hardened like cement. I reheated it five times after grouting, and there are no cracks.