MIL-STD-2199 Coverings For Waterborne Main Propulsion Shafting On U.S. Naval Surface Ships And SubmarinesThis standard covers standard practices for the application of a four-layer shaft covering system on the body areas of waterborne main propulsion shafting. Material and application requirements are also provided for coatings that are to be applied to waterborne shaft flange assemblies.

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MIL-STD-2199A APPENDIX A

FIGURE A-5.  Charging the reaction spray equipment with the components.

Two coats of elastomeric coating shall be applied, each coat being approximately 10 mils (0.010 of an inch) thick. Two different colors shall be used: the first coat shall be gray and the second coat shall be black.  Use of plural component spray equipment is recommended, as shown on figure A-6.  If plural component spray equipment is not used, the two components of the elastomeric coating shall not be mixed together until immediately before application immediately prior to use, since the mixture will have a limited working life.

FIGURE A-6.  Application of elastomeric coating by reaction spray at a shipyard. Application of the elastomeric coating shall be as follows:

NOTE:  For surface ship classes adhering to a dry dock periodicity of 10 years or less, the elastomeric coating may be omitted.  However, this exception does not apply to aircraft carriers.

a.    The first coat shall be gray in color.  Verify that the components to be charged to the reaction spray reservoirs are labeled as:

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