PC stand coated with rust inhibitor and method thereof

A method of producing a precast strand entirely coated with rust inhibitive material, which comprises twisting a plurality of peripheral wires about a core to form a strand, introducing said strand into an extruding machine while heating said strand, and extruding a rust inhibitive material of thermoplastic resin from a molding die disposed on a leading end of an auxiliary pressure head connected to a cross head of said extruding machine while melting said rust inhibitive material with heat to subject said rust inhibitive material to a internal resin pressure of at least 100 kgf/cm.sup.2, so as to form a rust inhibitive layer being in contact with the core and peripheral wires, wherein the cross head of the extruding machine has a length L1 and the auxiliary pressure head has a length L2, the length L2 being at least three times greater than the length L1.