Manual dispensing guns vary in mechanical advantage.
Higher mechanical advantage dispensers can produce more internal pressure. The higher the pressure the more chance for off ratio dispensing. To minimize off ratio dispensing, use as little pressure as possible to dispense the adhesive and maintain a constant forward motion of the cartridge pistons.
Some dispensers have a non-drip feature that releases pressure at the end of each stroke. This is a useful feature but it can add to off ratio dispensing if the gun is pumped and then paused between strokes. Apply a technique of constant motion and a rapid re-grip of the trigger.
