The technique of LbL nanocoating is uncomplicated and requires relatively low concentrations of the polyelectrolytes to produce an efficient coat, often in the low nanometer range. A substrate for coating is required, a polycation and separate polyanion solution, and clean water as the washing liquid. Figure 3 illustrates the technique. Numerous polysaccharides, especially GAGs, are charged polyelectrolytes and the next section will elaborate on this.