A coating apparatus for applying a coating on glass containers with a chemical compound comprising: a housing with a coating tunnel a conveyer belt moving the containers through the coating tunnel from the inlet to the outlet of the said coating tunnel one primary loop a separator that separates the carrier gas flow loaded with the coating compound coming from the coating tunnel in at least two distinctive flows and an air inlet for fresh air in proximity of the outlet of the coating tunnel, wherein the separator separates the carrier gas flow loaded with the coating compound in one first part of the carrier gas loaded with the coating compound in a first circuit called return loop and the other part of the carrier gas loaded with the coating compound in another second circuit called recycle loop going to the proximity of the inlet of the coating tunnel, and wherein the separator is situated behind or downstream in view of the flow of carrier gas loaded with the coating compound or air loaded with the coating compound that crosses more or less perpendicularly the central part of the coating tunnel, where the containers are passing on the conveyer belt, and wherein the return loop goes from the separator to the other side of the coating tunnel and the carrier gas loaded with the coating compound is reintroduced in to the coating tunnel through a jet slot, and wherein carrier gas loaded with the coating compound coming from the recycle loop is reintroduced in to the coating tunnel between the primary loop and the entry or inlet of the coating tunnel, and wherein the fresh air is introduced by a jet slot at the opposite side of the separator. a housing with a coating tunnel a conveyer belt moving the containers through the coating tunnel from the inlet to the outlet of the said coating tunnel one primary loop a separator that separates the carrier gas flow loaded with the coating compound coming from the coating tunnel in at least two distinctive flows and an air inlet for fresh air in proximity of the outlet of the coating tunnel, wherein the separator separates the carrier gas flow loaded with the coating compound in one first part of the carrier gas loaded with the coating compound in a first circuit called return loop and the other part of the carrier gas loaded with the coating compound in another second circuit called recycle loop going to the proximity of the inlet of the coating tunnel, and wherein the separator is situated behind or downstream in view of the flow of carrier gas loaded with the coating compound or air loaded with the coating compound that crosses more or less perpendicularly the central part of the coating tunnel, where the containers are passing on the conveyer belt, and wherein the return loop goes from the separator to the other side of the coating tunnel and the carrier gas loaded with the coating compound is reintroduced in to the coating tunnel through a jet slot, and wherein carrier gas loaded with the coating compound coming from the recycle loop is reintroduced in to the coating tunnel between the primary loop and the entry or inlet of the coating tunnel, and wherein the fresh air is introduced by a jet slot at the opposite side of the separator.