The invention provides a dosing device for a particulate material blasting apparatus comprising a dosing chamber having a base, a rotor carrying a plurality of circumferentially formed pockets ratably mountable with the chamber, a particulate product feed conduit adapted to feed particulate product onto a base of the dosing chamber adjacent a receiving side of the dosing chamber and a particulate product delivery conduit formed in the base of the dosing chamber adjacent a delivery side of the dosing chamber. The base of the dosing chamber is disposed with respect to the particulate product feed conduit such that particulate material will not spill over the base into the delivery conduit. The rotor is disposed with respect to the feed conduit such that particulate product fed onto the base of the dosing chamber will be picked up by the pockets formed in the rotor and lifted up and around the chamber from a receiving side of the dosing chamber to a delivery side of the dosing chamber.