Hair spray can be used on wet hair, but it is not recommended due to potential damage that it can cause. When hair spray is applied to wet hair, the alcohol in the product can dry out the moisture from the hair, leading to dry, brittle strands. This can cause breakage and split ends, and it can even damage the hair cuticles, making it more difficult to grow longer, healthier hair.
Additionally, when hair spray is applied to wet hair, the particles can become trapped in the wet strands, causing product buildup. This can weigh down the hair, making it look flat and dull.
For best results, it is best to wait for your hair to dry before applying hair spray. This will help to keep the hair healthy and give you better styling results. If you are in a hurry, you can use a blow dryer on a low heat setting to quickly dry your hair before spritzing it with hair spray. This will help to reduce the amount of heat damage your hair experiences.