The spag-less system is a special kind of drying of the moulds, to remove the absorbed water. This system does not use the heat but the compressed air introduced through a series of channels within the plaster mould.
These channels are normally obtained by placing a network of pipes made of permeable material inside the mould before casting the plaster. Obviously, these pipes are all connected to one or more collectors which will then be connected to the source of compressed air.
Whatever the technique used to create a network of channels inside the plaster mould, the introduction of compressed air into the mould makes it possible to quickly remove the water absorbed by the plaster during the casting stage.
This process also allows a reduced permanence time of the water in the mould, helping to increase its duration.