MIL-PRF-24647E
3.2.1 Anticorrosive paint (first coat). When required, the first coat of anticorrosive paint is intended for direct
application to the substrate being painted. Paint systems submitted for qualification to Classes 1 or 2 of this
specification shall be qualified with anticorrosive paints that conform to MIL-DTL-24441, MIL-PRF-23236, or a
commercial anticorrosive paint from the same manufacturer. Paint systems submitted for qualification to Class 3
(elastomeric substrates) do not require qualification with anticorrosive coatings, but shall be qualified with any
required adhesion-promoting tie-coat. The paint shall be a light, pastel color.
3.2.2 Anticorrosive paint (second coat). The second coat of the anticorrosive layer shall be gray, except as
noted in 3.4.1.b for submarine service.
3.2.3 Tie-coat. Tie-coat(s), if required, is intended for application to the anticorrosive paint and overcoated
with antifouling paint.
3.2.4 Antifouling topcoat. Antifouling topcoat(s) shall be of the applicable type (see 1.2.1).
3.2.5 System identification. Manufacturer shall, at the time of qualification submittal, identify by unique
nomenclature the total system being qualified and each individual product constituting the system by unique
alpha/numeric nomenclature [product name, alpha/numeric identification, color, and required application thickness
in micrometers (m) or mils (thousandths of an inch)]. At a minimum, the manufacturer shall identify the
following:
a.
All types, classes, grades, and applications, including any required adhesion promoting tie-coats.
b.
The product(s) constituting the antifouling topcoat(s).
c. For Classes 1 and 2, the commercial product designation for the vendor s approved MIL-DTL-24441,
MIL-PRF-23236, or commercial anticorrosive coating being qualified with the antifouling topcoat(s).
3.2.6 System modifications. Given the long duration of selected tests, it is conceivable that certain commercial
products may be modified over the course of the qualification process. The manufacturer shall note any changes.
Examples include, but are not limited to, paint VOC reductions or slight (less than 3 percent by weight) additive
modifications/additions. It is not NAVSEA s intent to discourage positive formulation changes; however, when
specified (see 6.2), the manufacturer will provide a written certification and technical justification that such changes
do not negatively affect the long-term properties of the material. Should the material properties discussed under
tables II, III, or IV be affected, the new material shall be submitted, and the qualification process repeated.
3.2.7 Underwater hull cleaning. The vendor shall estimate the frequency and process for underwater hull
cleaning. The vendor shall estimate the amount and type of coating damage that will result from completing the
recommended hull cleaning processes when hard-shelled fouling organisms (e.g., barnacles, bryozoan, tube-worms,
or oysters) are removed by cleaning. Estimates shall be based on cleaning a panel or hull when a minimum of
20 percent of the surface being cleaning is fouled with hard-shelled with vendor recommended cleaning equipment.
Unless approved prior to testing, mechanical cleaning shall not be allowed as a supplemental measure to satisfy any
of the requirements of 3.4.4.
3.3 Material requirements. The paint systems furnished under this specification, when mixed and applied in
accordance with the manufacturer s instructions, shall produce a coating that satisfies all the requirements of this
specification. The composition of the paint furnished under this specification shall be the responsibility of the
manufacturer, except as limited by this specification.
3.3.1 Types. The five types of antifouling topcoats will function in accordance with an identifiable release
mechanism, as specified in 1.2.1.
3.3.2 Classes. See 1.2.2.
3.3.3 Grades. See 1.2.3.
3.3.4 Applications. Applications shall be as defined in 1.2.4.
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