When using wood, it has to be sanded roughly first.
After rough sanding, the wood is soaked in unrefined lacquer until it is saturated. The rest is wiped away with a cloth. The wood should dry for about 2 days now. A roomtemperature of 20°C (68° Fahrenheit) and humidity of 80% are ideal conditions.
It has to be sanded again after drying.
Afterwards the pores are closed by Hachisabi-Urushi (ハチ錆漆), a mixture of unrefined lacquer, powdered clay and ricepaste. It is applied, rubbed into the wood, wiped and cleaned with a cloth and dried.
Unrefined lacquer is applied now to harden the wood. Excess lacquer is softly dapped away with a cloth. After drying it is slightly sanded.