MIL-STD-2199A APPENDIX A
A.3.2 Shaft covering system application.
A.3.2.1 First layer - primer application. Application of the primer shall be as follows (see figure A-2):
NOTE: For surface ship classes adhering to a dry dock periodicity of 10 years or less, the primer layer may be omitted. However, this exception does not apply to aircraft carriers.
a. Start the primer application as soon as possible after the abrasive blast (see A.3.1.1.g). Should the potential exist for surface contamination, due to blasting procedure or residue, isopropyl alcohol shall be used to clean the surface. Commercial grade denatured alcohol shall not be used owing to known bond breaking additives in many brands.
b. With a narrow paint brush (about 1 inch wide), apply the primer to the steel at the shaft-to-sleeve interface around the entire circumference. The primer darkens the color of the steel. The primer thickness shall be kept to the minimum amount that results in complete coverage. Complete coverage is indicated by a uniform color change. Repeat for all remaining sleeve ends of the shaft section(s) being coated.
c. Use a brush to apply primer to the sleeve end prep area(s). A wider brush may be used. As with step b, the primer thickness shall be kept to the minimum amount that results in complete coverage, indicated by a uniform color change.
d. Apply primer to the shaft body with a roller or by wiping with lint free gauze. As mentioned above, the primer darkens the color of the shaft. Once again, the primer thickness shall be kept to the minimum amount that results in complete coverage. Complete coverage is indicated by a uniform color change.
PRIMER
FIGURE A-2. Schematic showing the primer (the entire shaft and sleeve end are covered).
e. After the shaft body is coated with primer, use the 1-inch paintbrush to apply a second coat to each sleeve end prep area and shaft-to-sleeve interface.
A.3.2.2 Second layer - elastomeric coating application. The coating is a two-component system that shall be applied with reaction spray equipment. A typical system is shown on figure A-3 through A-7. The two-component elastomeric coating is available in 4.5-gallon (40-pound) kits. This equipment shall have reservoirs for the A and B components, as shown on figure A-3. The two components are not weighed out prior to use, however, they shall be individually agitated as shown on figure A-4. After mixing they are added to reservoirs that are part of the plural component spray equipment, as shown on figure A-5.
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