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 TM 55-1905-223-SDC
b. Where an individual patch has been applied with unsuccessful results. Either type patch may be
used as a supplementary repair.
Where the ruptured area cannot be isolated, the paste mixture prior to curing acts as a temporary seal,
after which the liquid impregnated cloth is applied as a permanent repair. This is based on the premise that
the paste mixture will not wash away as readily as the liquid.
In a compound rupture, paste may be used as a filler to form a flat surface so the woven roving can be
applied to form a flat patch.
8-24. SUGGESTIONS FOR USING PLASTIC REPAIRS. Both the paste and liquid resins with their
associated hardeners always are mixed in the same proportions: four parts of resin to one part of hardener.
The resin and hardener are packaged in their proper ratio. Add the hardener to resin and mix thoroughly until
a uniform gray color is observed. It is advisable when mixing paste resin and hardener to remove the
substances from the can and mix them on a dry, clean board; in this way, uniform color of mix can be more
easily observed.
One large can of liquid resin, 400 grams, when mixed with 100 grams of liquid hardener will give a total of
500 grams of activated resin, which is sufficient to thoroughly impregnate one strip of 6-inch by 40-inch
woven roving. Two grams of resin hardener mixture will impregnate 1 square inch of woven roving cloth.
Determine the quantity of resin hardener mixture required to impregnate the amount of woven roving to be
used.
Do not mix resin and hardener until all other preparations have been completed.
_________
WARNING
Heat and fumes are given off when using plastic repair materials. Chemicals can
cause serious burns to eyes or exposed areas of skin. Wear gloves provided to
protect hands and face shield to protect the eyes when making any
repairs involving the use of plastic resins. In the event resins do come into
contact with any part of the body, wash with large quantities of hot water and
soap and seek medical attention. Personal injury could result.
The patch should not be subjected to any pressure until the temperature of the patch has dropped below
150F.
8-25. PATCHING SAFETY PRECAUTIONS. Provide forced air supply and exhaust ventilation during the
time plastic materials are being used. This is most important during the time that heat and the resultant
fumes are given off. Also follow these precautions:
a. Prior to using plastic, use protective rubber gloves.
8-27
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