- Give hair heat-resistant body and power. Strong-hold mousse. Body-boosting curl and wave strengthener with UV protection – for de-frizzed curls, waves, and control. Apply to damp hair. Air- or diffuse-dry to accentuate waves and curls. Blow-dry for lasting body and volume. Learn from Diva Poulos, Sebastian International Artist: "Bring extra long lasting volume to your hair by mixing Mousse Forte and Gel Forte together."