other motivate air may be used for drying operations. In all instances where compressed-air is used, moisture traps shall be installed in the lines at a point adjacent to the expulsion jet. 3-41. Spraying is the most preferable method of applying type P-2 or P-3 preservative. Agitator-type pressurized containers should be used in conjunction with the spraying operation. Where types P-2 or P-3 preservatives are specified, one shall not be substituted for the other. Where mamually operated agitator-type containers are used, they shall be activated at least once each hour when in operation. 3-42. Type P-3 preservatives shal] be applied to the internal surfaces of hydraulic systems, spindle assemblies, and similar critical internal systems. Gear trains, shafts, ways, and similar less critical assemblies shall be preserved with type P-2 preservative. Following the applicatim of either type of preservative, thorough ventilating 18 essential. Closed amd confined systems shall be vented with low-velocity (fans) dry air for a sufficient period of time to vent off rapidly accumulating volatile material, Preservative application methods shall comply with Specifica- tion JAN-P-116. 3-43. All other unpainted or unprotected metal surfaces shall be preserved by covering with a uniform contimuous coating of type P-2 preservative. Surfaces which are normally protected with paint may be pre- served by repainting at the discretion of the responsible personnel, Name plates, serial numbers, and Government property tags shall be covered with tape during application of rust preventive. Tape shall be removed upon completion of the rust preventive treatment. 3-44. PROTECTION CF PRESERVATIVE. All finished surfaces of the equipment which have been preserved shall be protected from direct contact with any blocking or dunnage by the insertion of a greaseproof barriermaterial between the finished surfaces and the blocking or dunnage. The paper shall be wax-free on at least one side, amd the wax-free surface shall be placed next to the machine surface. Dunnage should be kept to a minimum consistent with good storage practice. 3-45. REASSEMBLY. In reassembly the same care shall be exercised in the handling of precision parts and assemblies as specified in 3-18 through 3-30. In the reassembly operations the preservative coatings on the various assemblies and parts will be disturbed in handling. As the work progresses, these areas shall be retouched and the final spray application so conducted as to seal off metal-to-metal close fits. Again, comprehensive ventilating shall be conducted to vent off volatiles and to permit the setting up of the preservative film. In those instances of metal to metal contact of heavy assemblies both mating surfaces shall be coated with preservative. Traversing of the moving unit shall be conducted, and that area of traverse on the stationary element again shall be sprayed with preservative after the traversing element has been returned to the position best suited to prevent overhang and to a well- supported position on the machine frame or casting. The traversing element shall then be locked or otherwise secured in position. Fittings shall be charged with type P-2 preservative. 18-35