The use of the mixer minimizes operator setup of the machine for different kit configurations, reduces worker fatigue, and ensures the user a more thorough and consistent mix, kit to kit. Features include: single switch adjustment to mix common aerospace Semkit package configurations, including 2.5oz with 6 dasher rod, 2.5oz with 8 dasher rod, 6oz with 6 dasher rod, 6oz with 8 dasher rod, 8oz with 8 dasher rod, automatic injection of catalyst (injection style Semkit packages), guarding door to ensure operator safety during mixing, stroke counter for improved consistency and quality, fully pneumatic non-electrical operation, and a heavy-duty motor to manage very high viscosity materials.