The mixture of zinc dust and sulfur flower is a powder, which can be used as such: pored into the rocket motor (insolated at the inside), gently stamped, provided with an igniter and diaphragm and launched.

The powder can however also be liquefied above 121°C (and under 157°C). After cooling down a hard, high density (generally above 3.5 g/cm³) solid propellant grain is the result. This approach required some equipment. Depending upon the approach one can melt the powder in a mold and leave it there to solidify or the propellant can cast in a mold. I prefer the first because in this case there is no need for any intervention, which reduces the risks. In the first case is needed: a heating plate, an oil bath of sufficient height (depending upon the size of the motor block which is needed), a mold well sealed from the oil which contains the powder to be melted, a (preferentially) electronic thermometer (up to 200°C). Ones the propellant rod has cooled down it must be inhibited. The procedure is very similar to the KNO3-sugar propellants, but in the first approach there is no need for mixing during melting. The whole process can be done without any manual intervention.

Solid grains have the advantage that aluminum can be added to the mixture in order to make it more powerful.