A method for conveying of coating powder and a powder spray coating device as well as a powder conveying apparatus of a powder spray coating device, comprising a powder is tightly current pump (10) and a flexible powder delivery tube (28), which is in contact with the powder delivery side (26) of the powder is tightly current pump (10) is or can be connected to the delivery of coating powder, wherein the hose wall completely or at least on the hose on the inside surface of an electrically insulating material, characterized in that the hose on the inside surface has a surface roughness, which is between 2 μm and 7 μm.
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