Typical Fiberglass Repair Procedure - PREVOST H3-41 Maintenance Manual

Apply the material with a putty knife or similar
object, building material up to the desired
contour. For deep filling and on vertical surfaces,
several layers of material may be used.
A hacksaw blade, held flat to adjacent contour
and then moved in a sawing action across the
repair when the resin is in a gel state, will
remove excess resin from repair. Finish repair
with the same procedure as when using
fiberglass cloth.
7.3 TYPICAL FIBERGLASS REPAIR
PROCEDURE
Remove all loose particles or damaged material
using a power sander or rasp. Clean area,
overlapping hole approximately 1" to 1-½" (25-40
mm) all around. Remove all dirt, grease and
paint from area to ensure good bonding surface.
Feather the cleaned area all around (Figure 3).
FIGURE 3: FIBERGLASS REPAIR
Cut a piece of fiberglass mat slightly larger than
area being repaired. Impregnate mat with
general purpose polyester
normally. Use a clean paint brush to apply the
polyester resin. Apply impregnated mat over hole
and press onto surface with brush to obtain good
adherence. Another coat of general purpose
polyester resin can be applied at this time
(Figure 4).
NOTE
Remove all air between surfaces being joined.
Allow area to harden and sand surface to
remove any wax.
18089
resin catalyzed
PA1621 Maintenance Manual All Series
SECTION 18a: H3 SERIES BODY
FIGURE 4: FIBERGLASS REPAIR
Apply another mat, followed by a cloth patch,
and another mat. All layers must be thoroughly
impregnated with polyester resin, brushed well
and free of air. Apply more layers of mat and
cloth as required until the desired strength and
thickness is obtained, minimum two 1-½ oz
(43 g) mats and one 9 oz (255 g) cloth (Figure
5).
FIGURE 5: FIBERGLASS REPAIR
Allow area to harden and contour the area with
coarse sandpaper #100 (Figure 6).
FIGURE 6: FIBERGLASS REPAIR
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Revised Sept 2019
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