Yes. Protein Spray must be used immediately prior to the colour application, as the hair needs to be dampened from the product. Very porous hair will suck in any moisture applied (e.g. colourants) and generally during the colouring process, this is the cause of any damage. However, if Protein Spray is applied to the hair first, the moisture from this product is pulled into the hair creating a buffer that fills gaps and vulnerable areas prior to the chemicals entering. In addition, it is important that very dry or damaged hair is somewhat damp as it enables colourants to go onto the hair smoothly and not over absorb in specific areas.