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Old 05-14-2015, 01:30 PM   #1
Jim Jackson's Avatar
Join Date: Nov 2010
Posts: 59
fiberglass bonnet starting to crack

I have a crack starting to develop on my c class bonnet horizontally as it rolls down toward the bottom just above the cab. It started small and I put a piece of tape on it, just to maybe hold it there. Now it has spread to about 18 inches, its not deep, it's like the fiberglass would eventually fold at that point. I called a rv body shop and they said they would add glass from the inside and described a very professional and surely expensive fix.
I'm going to put several coats of Poly glow on it and see if it heals, I wonder if any one else has ideas about this ? thanks, Jim

Jim and Linda Jackson
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Old 05-14-2015, 01:49 PM   #2
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Join Date: Feb 2012
Posts: 1,137
Jim...they call that a spider crack.... so in order to stop the crack...you need to take a 1/4 drill bit and drill and drill the beginning of the crack and the end....then to repair it you might add a half dozen or more additional holes along the crack between the beginning and end holes. You fill the holes with bondo....and can even add a layer of fiberglass cloth over the area. Then sand and repaint.
That is a standard method to repair a fiberglass spider crack

Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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Old 05-14-2015, 02:12 PM   #3
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I just cleaned the bonnet and, by gosh, there's more of them. Thanks for the fix.
Jim and Linda Jackson
Coachman Freedom
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