Tools, Tips, Technique
Hair spray is easily found from the corner drug store to hair specialty stores.
An important consideration for me is the quality of the micro-diffuser and the pressure. If there is a problem with blockage I remove the diffuser from the top and soak it is boiling water this generally works to release any solidified product.
Remember to use spray at a distance. It can be harmful to the skin and eyes so always protect them, and if used too close to the hair you cannot take advantage of the micro-diffusion and you will just end up wetting the hair in one place.
I have no preference for one spray over another. However, I do have a preference for strong, high quality micro-diffusion.