MIL-PRF-24647E
(3) Manufacturer commercial ship patch tests shall be on commercial, Military Sealift Command (MSC),
Maritime Administration (MARAD), or other Government agency ships. The application and inspections shall be
certified and verified by a disinterested third party mutually agreed on by NAVSEA and the paint vendor and shall
be at the vendor s cost. The ship operations (travel routes, ports, times in port, and lay-up times) shall be recorded.
(4) Tests of paint systems intended for elastomeric substrates shall be conducted only on Government
ships having extensive elastomeric surfaces.
f. Full ship applications shall consist of a full hull application of the manufacturer s total commercial system,
except that the following shall be included:
(1) Unless waived by NAVSEA, there shall be a control paint system applied consisting of a system
chosen from the qualified products list (QPL) of this specification, or as otherwise approved by NAVSEA. This
control paint system shall be applied to provide a comparator for the test system.
(2) Commercial, MSC, MARAD, or other Government agency ships applications and inspections must be
certified and verified by a disinterested third party mutually agreed on by NAVSEA and the paint vendor at the
vendor s cost. The ship operations shall be certified and verifiable with travel, port time, and lay-up times
documented.
(3) The application and inspections of full ship applications to Government ships shall be at a Naval
shipyard or under Navy contract at a commercial shipyard. The application shall be inspected by a Navy
representative at Navy cost.
g. Paints in service on Navy ships will be monitored by the Government for 2, 5, 7, or 12 years, as
appropriate. Paints shall meet the requirements of 3.4.4.2.3.
4.4.2 Recoatability.
4.4.2.1 Types I, II, and IV. Two panels from each set of test systems shall be retrieved from those tested in
4.4.1.1 after completion of the required test. These panels shall be removed from test and shall be cleaned for a
period not to exceed 2 minutes with freshwater at a nominal pressure of 15,000 to 20,000 kPa (2175 to 2900 psi).
Test panels shall not be allowed to dry between being removed from test and the pressure cleaning. Dry for 24
hours at ambient conditions. Recoat one-half of each test panel with one coat of the same topcoat as originally used.
Recoating shall be in accordance with the manufacturer s ASTM F718 instructions. Application and curing of this
recoat paint film shall be in accordance with the manufacturer s ASTM F718 instructions. The recoated panels shall
be immersed for 3 months as specified in 4.4.1.1.e. Rate as specified in 4.4.1.1.e. Test paints shall meet the
requirements of 3.4.8.
4.4.2.2 Types III and IIIa. Two panels of each set of test systems shall be retrieved from those tested in 4.4.1.1,
after completion of the required test. These panels shall be removed from test and shall be cleaned for a period not
to exceed 2 minutes with freshwater at a nominal pressure of 15,000 to 20,000 kPa (2175 to 2900 psi). Test panels
shall not be allowed to dry between being removed from test and the pressure cleaning. Dry for 24 hours at ambient
conditions. Recoat one-half of each test panel with one coat of the same topcoat as originally used. Recoating shall
be in accordance with the manufacturer s ASTM F718 instructions. Application and curing of this recoat paint film
shall be in accordance with the manufacturer s ASTM F718 instructions. The recoated panels shall be tested for
3 months as specified in 4.4.1.1.i. Rate as specified in 4.4.1.1.i. Test paints shall meet the requirements of 3.4.8.
4.4.3 Volatile organic content (VOC). VOC shall be determined in accordance with EPA Method 24
4.4.4 Storage stability.
4.4.4.1 Shelf life. Store an original, unopened container of each individual paint or component of the system
for two years under warehouse conditions, at or below 27 °C (80 °F), and at or below 50 percent relative humidity.
Original, unopened containers of Type III and Type IIIa paints shall be stored for up to one year under the same
warehouse conditions. Paints shall conform to the requirements in 3.4.3.1.
4.4.4.2 Partially full container. Expose a sealed, two-thirds full container [4 liters (1 gallon) or less] of each
individual paint or component of the system for 7 days at 60 °C (140 °F). Paints shall conform to the requirements
in 3.4.3.2.
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