According to the Jean Louis David salon, hairspray is not likely to cause any long-term damage to hair when it's used in moderation. Processes for cleaning away hairspray buildup help avoid hair damage.
Hairspray is meant to be used once between each shampooing. Shampooing hair in between each style can prevent product buildup that can cause hair to appear dull and flaky.
Many people believe hairspray is harmful to hair because it contains alcohol. Some types of alcohol, such as ethanol alcohol, can be drying to hair. Other types of alcohol used in hairspray, however, are not drying and are often found in shampoos and conditioners.