TM 5-1940-321-13&P
g. A small amount of force is required to peel away glued fabric, but excessive coating rather
than separating the glue bond. Continue to apply heat while peeling until the glue bond is completely
separated.
F-6. PATCHING TECHNIQUES. The majority of F530 IAB corrective maintenance consists of gluing
fabric patches to the craft. Patches are applied to stop air leaks, to prevent further abrasion of fabric that
is worn from service, and to stop water leaks. The patching techniques described in this section are also
applicable to the replacement of the transom and thrust board. Fabric patches applied to these wooden
components have a structural function. Patching requires a thorough knowledge of the basic shop
practices for a fabric repair identified in previous paragraphs of this appendix. Table C-1 is a step-by-step
gluing schedule. Table F-2 lists general patching procedures.
a. Patching Material. The correct fabric, glue, and solvent for the material being patched must
be used (see paragraph F-2).
b. Patching Procedures. The table F-2 patching procedure is a step-by-step sequence
applicable to all types of patching. Refer to the referenced paragraph for more specific instructions on
each step.
c. Patch Size and Shape. Patches should extend 2 inches in all directions beyond the area
that leaks. The minimum size patch that should be applied is a 4-inch diameter circular patch. Patch
shape is determined by the shape of the damaged area. Trace the shape on the material using a silver
fabric marking pen (PN 7110). Round all corners of patches. Rounded corners are less likely to lift and
provide a more professional, factory-like appearance. Bottle tops and container lids can be used to trace
uniform rounded corners on the fabric. Use only scissors to cut out the patch. Place the patch on the craft
and trace its outline with a silver fabric marking pen as shown in figure C-14. Rectangular patches should
be applied so that an edge is parallel to a seam. Both the craft and patch must be scuffed (strongan fabric
patches are not scuffed). Tape 1/16-inch outside tracing on craft. Refer to gluing schedule (table C-1) for
gluing procedure.
