Compact hairspray product consisting of hairspray concentrate, container and fine spray pump with pre-pressurization

A compact hair spray product comprising

• a hair spray concentrate having a viscosity permitting good sprayability;
• a pressure-tight and diffusion-proof container containing said hair spray concentrate;
• and
• a fine-spray pump associated with the pressure-tight and diffusion-proof container for spraying said hair spray concentrate;
• wherein said hair spray concentrate contains at least one hair-strengthening polymer;
• an alcoholic solvent for said at least one hair-strengthening polymer and at least one organic solvent additive;
• wherein said at least one organic solvent additive is liquid under normal conditions, is capable of reducing viscosity of said concentrate and is capable of increasing vapor pressure of said concentrate;
• and
• wherein said fine-spray pump has a cylindrical region made of a swelling-resistant material, said swelling-resistant material resists swelling by said at least one organic solvent additive, said fine-spray pump has a maximum lift of 0.12 mL and said fine-spray pump has pilot pressure buildup.