LOreal Studio Hot Curl Thermo Curling Spray. L Oreal Studio Hot Curl Curling Spray is for use with curling tongs and hairdryers. It protects the hair and gives a long lasting bounce and shine. Curling Spray uses thermo-elastic technology to make your hair look great. Hot Curl curling spray specially developed for use with curling tongs and hairdryers with a diffuser.. long lasting bounce and definition, satin-smooth curls, helps protect the hair. Use with a curling tongs or other heated curling appliances to create well defined curls on all types of hair.. Apply hot curl to perfectly detangled dried or blow dried hair. Spray along the length of each section (around 2 to 3 pumps) and spread well using your fingers. Wind each section around your heated appliance and hold for the period of time indicated by the appliance instructions. Use with a hairdryer and diffuser attachment to give bounce to your curly hair. Dry hair from underneath with a diffuser without touching your scalp.