provided as recyclable capsule which may be refilled after use for example by a service provider fig3 shows a lower portion of the device according to the invention in cross section according to a further embodiment also with respect to the configuration shown here the container 25 is closed by a cover wherein the cover however has no further or no second cover at all a basket 30 is arranged in the inner space 26 of the container 25 in which the molded parts to be treated are received the basket may be configured as a lattice basket at the bottom of the container 25 an agitator is arranged which here is configured as an oblique blade agitator and which is provided for mixing the surface treatment agents with the substrate in contrast to the configuration shown in fig1 here the capsule mount 20 itself may also have the structure of a lattice basket 30 i e it may be configured as a lattice box as far as the capsule mount 20 is configured as a housing at the bottom of the housing at least one opening 16 is provided through which the nozzles 17 described in the following may be advanced towards the capsule 5 which is arranged in the capsule.