Cosmetic dispenser housing and method

Doses of cosmetic fluid dispensed from a roll-on dispenser can fluctuate significantly between successive applications. This problem can be alleviated by perturbing flow within the roll-on housing, such as air flow, by forming flow perturbators on the interior side-wall of the housing. These perturbators can alternatively or additionally comprise lateral beads or notching an interior sealing ring. The dispenser housing preferably also includes a spider normally located between the roller and the bottle interior, and preferably a resilient spider having an facing surface parallel with the roller that can control the depth of liquid film adhering to the roller, which when the roller is a ball means a concave upper face of similar radius of curvature to that of the ball.