Define the user experience in numbers
Priming, Spray Pattern and Actuation Force Explained is best approached as a measurable packaging decision, not a visual preference. Pump output should be stated as a target range per actuation, not simply described as fine or strong. Record priming strokes, spray angle, plume consistency, actuation force and recovery. Test several pumps across the sample lot because one attractive demonstration unit cannot describe production variation.
Cut the dip tube for the real bottle
Dip-tube length depends on the internal bottle height, shoulder geometry, tube stiffness and desired end position. A tube that is too long can curl and restrict flow; one that is too short leaves excessive product behind. Approve a cut-length rule and tolerance using the intended bottle and pump combination.
Test with the intended fragrance
Alcohol level, oils and other formula characteristics can affect gasket compatibility, swelling, evaporation and spray quality. Run filled stability and leakage checks in normal, inverted and side orientations. When the fragrance changes, confirm whether the existing packaging evidence still applies.