Abstract: The present invention provides a powder coating composition comprising A) 40 to 95 wt % of at least one resin binder selected from the group consisting of polyester resins, epoxy resins, urethane resins and (meth)acrylic resins, B) 5 to 60 wt % of a filler mixture comprising talcum and at least one additional filler, C) 1 to 20 wt % of at least one wax additive selected from the group consisting of polyamide wax, polyethylene wax and zinc stearate, and D) 0 to 95 wt % of at least one cross-linking agent The wt % amounts are based on total weight of the powder coating composition; The powder coating composition cures rapidly and completely and makes it possible to receive coatings with improved flow properties as well as a high smoothness and excellent sandability without any texture on surfaces of heat-sensitive substrates.