KMS HAIRSTAY anti-humidity seal 4.1 oz./117 g. HAIRSTAY anti-humidity seal acts like an umbrella for the hair. Shielding your hair from humidity and frizz for up to 72 hours. Spray 10-12 inches from dry hair as an umbrella from humidity over the final style. Acts like an umbrella for the hair. Shields hair from humidity and frizz for up to 72 hours. Weightless shine spray flexible sealing compounds. Trisiloxane – provides shine. Dimethicone – polymer that protects against humidity.