• Panel repair for both flexible and rigid panels
are basically the same. The primary difference
between flexible panel repair and rigid panel repair
is in the adhesive materials used (Fig. 6).
• The technician should first decide what needs to
be done when working on any type of body panel.
One should determine if it is possible to return the
damage part to its original strength and appearance
without exceeding the value of the replacement part.
• When plastic repairs are required, it is recom-
mended that the part be left on the vehicle when
every possible. That will save time, and the panel
will remain stationary during the repair. Misalign-
ment can cause stress in the repair areas and can
result in future failure.
VISUAL INSPECTION
Sheet Molded Compound (SMC) and Resin Transfer
Molded (RTM), because they are composites, react dif-
ferently to impact that sheet metal does. Composite
materials can mask the severity of an accident. Adhe-
sive bond lines, interior structure of the doors, and
steel structure need to be inspected carefully to get a
true damage assessment. Close inspection may require
partial removal of interior trim or inner panels.
Identify the type of repair:
Puncture or Crack – Damage that has penetrated
completely through the panel. Damage is confined to
one general area; a panel section is not required. How-
ever, a backer panel, open fiberglass tape, or matted
material must be bonded from behind (Fig. 7).
PANEL SURFACE PREPARATION
If a body panel has been punctured, cracked, or
crushed, the damaged area must be removed from
the panel to achieve a successful repair. All spider
web cracks leading away from a damaged area must
be stopped or removed. To stop a running crack in a
SMC or RTM panel, drill a 6 mm (0.250 in.) hole at
the end of the crack farthest away from the damage.
If spider web cracks can not be stopped, the panel
would require replacement. The surfaces around the
damaged area should be stripped of paint and freed
from was and oil. Scuff surfaces around repair area
with 360 grit wet/dry sand paper, or equivalent, to
assure adhesion of epoxy repair materials.
PATCHING PANELS
An RTM or SMC panel that has extensive punc-
ture type damage can be repaired by cutting out the
damaged material (Fig. 8). Use a suitable reciprocat-
ing saw or cut off wheel to remove the section of the
SMC or RTM panel that is damaged. The piece cut
out can be used as a template to shape the new
patch. It is not necessary to have access to the back
of the panel to install a patch. Bevel edges of cutout
at 20 degrees to expose a larger bonding area on the
outer side. This will allow for an increased reinforce-
ment areas.
Fig. 6 Fiberglass Tape
Fig. 7 Damage Component
1 – PUNCTURE
Fig. 8 Damaged Panel Cutout and Patch
1 – CUTOUT
2 – DAMAGED BODY PANEL
3 – 4MM (0.160 IN.) HOLES
4 – PATCH CUT TO SIZE
JX
BODY
23 - 37
SERVICE PROCEDURES (Continued)