Page 202 2
nd
Edition – Rev 0
51-20
DAMAGE CLASSIFICATION AND REPAIRS – MAINTENANCE PRACTICES
If a surface patch is to be installed (for damage larger than 1 inch in diameter), trim
away the damaged area and round all corners. Cut a piece of plastic of sufficient size to
cover the damaged area and extend at least 3/4 inch on each side of the crack or hole.
Bevel the edges as shown in figure below.
If the section to be repaired is curved, shape the patch to the same contour by heating it
in an oil bath at a temperature of 248 to 302 °F, or it may be heated on a hot-plate until
soft. Boiling water should not be used for heating.
Coat the patch evenly with plastic solvent adhesive and immediately place it over the
hole. Maintain a uniform pressure of 5 to 10 psi on the patch for a minimum of 3 hours.
Allow the patch to dry 24 to 36 hours before sanding or polishing.
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