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TM 55-1915-200-SDC
hardener mixture. The paste mixture was developed primarily for small holes and cracks under one inch in diameter. In
many respects, the paste mixture has the same general characteristics as the liquid mixture. The paste mixture is
approved for patching, but is not limited, to the following:
(1) Sea chests.
(2) Valve bodies.
(3) Pump casings.
(4) Cooling water jackets.
(5) Condenser heads.
(6) Flanges.
(7) Caulking for leaking seams and rivets.
(8) Porous castings.
(9) Threaded joints.
8-17. DESCRIPTION OF BASIC MATERIALS. The basic materials used in patching are described in the following
a. Resins and hardeners. The liquid and paste resins are of the epoxy type. The liquid and paste hardeners are
chemical compounds used to harden the resins. These ingredients are packaged in prescribed amounts. When the
hardeners and resins are mixed, a chemical reaction occurs which causes the mixture to harden. The liquid mixture sets
in approximately 12 minutes, the paste mixture in approximately 17 minutes.
Do not mix hardener with resin until all preparations have been completed and do not intermix
liquid resin and paste hardener, or paste resin and liquid hardener. Do not mix resin or hardener
from any other source with those supplied in this kit. Improper use may cause violent chemical
reactions which can cause serious personal injury.
b. Void cover. This is resin-treated glass cloth that can be cut and formed to cover and support the patching
materials over a damaged area.
c. Woven roving cloth. This substance is made of a short staple, glass fiber woven into a thick fluffy cloth. During
the application of a plastic patch, this cloth is coated with the resin hardener mixture and wrapped around or placed over
the damaged section. This cloth provides the principal strength of the patch and provides a method of applying the resin
hardener mixture.


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