I have to case harden parts for a customer I have. I have been using a compound name Kasnite which works good but leaves a scale on the parts which has to be removed. I do this by glass beading the parts,which is very time comsuming. Does anyone know of another compound or process that will not leave a scale on the surface of the heat treated part? The customer will not go to tool steel but requires 12L14 steel to be used. Thanks for any replys.