We have used a Spintech for years spreading corn and seed. The only issue we had was mounting it to low on an atv. Banged it hard while crossing a ditch and broke the magnets in the motor. Replaced the motor and adjusted mounting height and no more problems. The spintech uses a centrifugal plate to seal the funnel when not operating. Fine seed will have some leakage unless adjusted properly. No problem at all with corn, peas, beans and the like.