REPAIR INSTRUCTIONS USING FIBER GLASS MATERIAL
Figure 26. - Covering Repair Area with Separating Film
5.
Then, using a cardboard template (Figure 27),
cut the required pieces of mat large enough to
extend 2 inches beyond the edges of the repair
area.
NOTE-The number of layers of mat used in
the backing patch depends on the thickness
of the body panel being repaired. Refer to
Figure 28 to determine the number of layers
required. Automotive parts are normally 2.5
mm (0.100 In.) thick. Therefore, the minimum
backing patch thickness must be 3.2 mm
(0.126 In.) or three layers of 42g (1-1/2 oz.)
mat.
Figure 27. - Cutting Fiber Glass Mat
THICKNESS OF
ORIGINAL PIECE
LAYERS OF FIBER GLASS
MAT REQUIRED FOR PATCH
mm
Inch
quant
g
OZ
2.5
0.100
3
42
1-1/2
2.8
0.110
3
42
1-1/2
3.0
0.120
2
42
1-1/2
1
57
2
3.3
0.130
1
42
1-1/2
2
57
2
3.6
0.140
3
57
2
4.3
0.170
2
42
1-1/2
2
57
2
Figure 28. - Backing Patch Mat Layer Requirements
6.
Mix the recommended amount of polyester resin
according to the manufacturer’s instructions.
7.
Apply some resin to the working area of the
separating film (Figure 29).
Figure 29. - Applying Resin to Separating Film
8.
Soak the first layer of mat in resin; then’ place it
over the repair area and allow it to harden
slightly.
9.
Now lay-up by hand the remaining piece or
pieces of resin-soaked mat (Figure 30).
NOTE-To prevent the patch from sliding on a
vertical surface, tape a piece of plastic film
over the patch.
CTS-4049
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