Abstract: Heat sensitive substrates, as well as others such as metal or glass, are electrostatically coated with a thermosetting coating powder comprising a melt-mixed, chilled, chipped, and powdered blend of an epoxy resin and a catalyst therefore, and a polyamine as a powdered low temperature curing agent along with a scavenger which will react secondarily with residual polyamine domains that do not contact the base epoxy resin during curing. The coating powder is deposited on the substrate and heated to fuse, flow and cure. The mixture of resin and catalyst does not cure within the extruder but it is made to cure at low temperatures on the desired substrate by the separate addition of the curing agent to the powdered melt-mixed blend.