The main difficulty with pastes and high viscosity products that do not flow is that the pump cannot be primed and simply cavitates, pumping air instead of product! The solution is to use a Kecol Maxiprime twin cylinder pressure priming system in conjunction with a Kecol stubby type piston pump, maintaining a positive prime on the pump and thus ensuring that it does not cavitate. As the product level falls, the sides of the drum are wiped clean by the follower plate on the priming system.