General Specifications - Appendix 6
AND CEMENTING VESSELS
OF THE UNITED STATES NAVY
Edition of June 1943
Chapter 1. - General
The instructions contained herein
shall govern work done by contractors or navy yards. No departure
shall be made form these requirements without specific
authorization. Where the term "contractor" is used, it
shall refer to both private firms and to navy yards.
Before the vessel is 35 percent
complete a painting schedule shall be prepared by the contractors and
submitted for approval by the Supervisor of Shipbuilding. This
schedule shall show each section and compartment and their dissimilar
parts, listing painting and cementing required and the appropriate
reference to the Specifications.
Upon delivery the painting and
cementing work on the vessel shall be in an acceptable serviceable
condition. The contractor shall be required to accomplish such
repairs, replacement or repainting as may be necessary to produce this
At the discretion of the Supervisor
of Shipbuilding, the fourth coat of exterior finishing paint of vessels
under construction may be omitted providing that in authorizing omission,
painting will be required which will afford satisfactory protection for
the preservation of material. This omission will result in earlier
delivery of the vessel concerned.
All materials used in painting and
cementing shall conform to the requirements in the applicable Federal and
Navy Department Specifications. These materials and their usage
shall be in accordance with general instructions herein. The
contractor is encouraged to use the latest specifications available,
regardless of the date of contract. Changes under the contract will
be considered to cover changes in cost and weight whenever these may be
At private yards, material shall be
subject to test at any time by the Supervisor of Shipbuilding. All
material shall be kept available for inspection. Samples for test
shall be sent to the Test Laboratory, Navy Yard, Philadelphia, Pa., or the
Navy Yard, Mare Island, Calif., or the Navy Yard, Norfolk, Va. A
test at a private laboratory may be made at the request and at the expense
of the contractor, if approved by and reported to the Supervisor of
Shipbuilding. Materials failing tests shall be rejected for use and
work already done with these materials shall be removed.
Paints recently formulated are far
superior in duration to those made according to older formulas. They
are made to give good hiding and durability in thin films and should be so
applied in order to minimize the fire hazard, prevent cracking and
peeling, and to conserve weight. Primers have been found to be most
effective at a thickness of from 0.0007 to 0.0010 inch and should be so
For general interior painting a
two-coat system as follows is considered adequate:
One complete coat of primer
formula 84 shall be applied. This may be the original after
pickling paint formula 84, touched up; or a complete coat over the
remains of the after pickling coat or the bare steel. The finish coat.
The thickness of this system shall
not exceed 0.0002 inch.
Exteriors shall be painted with a four-coat system for better weather
The after pickling primer
The second priming coat
formula 84 overall.
An under coat overall.
A top coat.
Galvanized exteriors will require
only three coats, since no after pickling primer will be applied.
Except for touching up and for
marking, all paint shall be spray coated whenever possible.
Cements and gunning compounds.
Portland cements shall not be used
unless specifically directed and shall never be used for the sole purpose
of filling voids.
Pastes or gunning compounds shall be
used only when oil and water tightness cannot otherwise be attained.
To conserve weight, they shall be used sparingly.
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