Fiberglass crack - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-13-2012, 09:45 PM   #1
Junior Member
 
Name: Mike
Trailer: KZ Sportsmen
Michigan
Posts: 1
Fiberglass crack

I have a 3 inch hairline crack below the roof of my 10 year old RV due to an awning breaking off. Awning repair guy wants to drill a hole at the bottom to prevent spread and fill/cover it with Par Bond. Does this sound like a reasonable fix? Mike
__________________

__________________
paxchristus is offline   Reply With Quote
Old 08-13-2012, 09:50 PM   #2
Senior Member
 
Perry J's Avatar
 
Name: John
Trailer: 16' Casita
California
Posts: 975
Send a message via AIM to Perry J Send a message via Yahoo to Perry J
If you don't drill the hole the crack will continue to get longer
__________________

__________________
Perry J is offline   Reply With Quote
Old 08-14-2012, 09:07 AM   #3
Senior Member
 
Name: Art
Trailer: Helite
Posts: 164
It's called STOP DRILLING. Just drill the hole then push some calk in it.
__________________
Art VanDelay is offline   Reply With Quote
Old 08-14-2012, 09:18 AM   #4
Senior Member
 
D White's Avatar
 
Name: Dave
Trailer: Trails West Campster, CampStar, Uhaul, Fiberstream
Washington
Posts: 184
I disagree about the hole drilling thing. If the force that was causing the crack is no longer there, it won.t continue to crack. If the force is still there, it will continue to crack, hole or not....Dave
__________________
D White is offline   Reply With Quote
Old 08-14-2012, 09:42 AM   #5
Senior Member
 
fusedlight's Avatar
 
Name: gary
Trailer: 16' 1998 Scamp
Minnesota
Posts: 672
Registry
Waving my arms in the air here a bit (my family calls it "facts by Brown") I would posit that even if the initial downward force was NOT there the crack could still propagate due to vibrations in the trailer during towing. The fiberglass on either side of the crack will vibrate at a different rate and the crack will elongate even in the absence of a vertical load.

As to the hole stopping the propagation... makes perfect sense (see my arms waving??). The biggest point of stress is at the bottom of the crack. ALONG the crack there's not much stress. Putting the hole in and filling it with a strong dollop of goop will "lock" that point in place so it doesn't experience the splitting force that's caused by the vibration in the first place.
__________________
fusedlight is offline   Reply With Quote
Old 08-14-2012, 11:10 AM   #6
Senior Member
 
kirkman's Avatar
 
Name: Jason
Trailer: 2007 Eggcamper & Homemade Tear Drop
New York
Posts: 656
Registry
Try this first!!!!
Capt. (Captain) Tolley's Creeping Crack Cure Hairline Crack Sealer 603-435-7199-
__________________
kirkman is offline   Reply With Quote
Old 08-14-2012, 11:53 AM   #7
Senior Member
 
Bob Miller's Avatar
 
Name: Bob
Trailer: 1973 Hunter Compact II
California
Posts: 7,912
Standard practice in plexiglass aircraft windshields used to be (and may still be) drilling a stop hole at the end of any cracks. As mentioned, as soon as there is a crack, entirely different sets of stress go to work.

BTW: Capt Tolley's stuff works, I've used it for years, but still, drill that small hole to stop things.
"Drill Baby Drill"
__________________
Bob Miller is offline   Reply With Quote
Old 08-14-2012, 02:43 PM   #8
Senior Member
 
D White's Avatar
 
Name: Dave
Trailer: Trails West Campster, CampStar, Uhaul, Fiberstream
Washington
Posts: 184
Quote:
Originally Posted by Bob Miller View Post
Standard practice in plexiglass aircraft windshields used to be (and may still be) drilling a stop hole at the end of any cracks. As mentioned, as soon as there is a crack, entirely different sets of stress go to work.

BTW: Capt Tolley's stuff works, I've used it for years, but still, drill that small hole to stop things.
"Drill Baby Drill"

This is fiberglass, not plexiglass...it has weave crisscrossed everywhere...Why would you want to drill a leaking hole in and area that is only cracked, and not leaking???
__________________
D White is offline   Reply With Quote
Old 08-14-2012, 03:30 PM   #9
Senior Member
 
Bob Miller's Avatar
 
Name: Bob
Trailer: 1973 Hunter Compact II
California
Posts: 7,912
Easy Answer, because it stops the crack from moving further. We also would drill a stop hole in Corvette fiberglass cracks before repairing. The strands from the chopper gun will help keep the area intact, but they don't always stop the crack from continuing in the resin.
That worked on my first Corvette, a 1954, and my last Corvette, a 1989, all of which are famous for developing cracks in the fiberglass. Not to mention 2 Meyers Manx's, a Meyers SR-II and about 4 Toyota Sunraders.
This is for cracks in the fiberglass, not spider web cracks, that usually are only in the gelcoat.
BWT: If drilling a 1/8" hole creates a leak problem, fix the crack and the hole, at least the crack won't get bigger.
__________________
Bob Miller is offline   Reply With Quote
Old 08-14-2012, 07:04 PM   #10
Member
 
Name: Neil
Trailer: Boler
California
Posts: 53
Registry
Same principle works on leather too. A clean, punched hole in a belt doesn't tear like a jagged hole made with a nail.
__________________
nlife is offline   Reply With Quote
Old 08-14-2012, 07:05 PM   #11
Senior Member
 
D White's Avatar
 
Name: Dave
Trailer: Trails West Campster, CampStar, Uhaul, Fiberstream
Washington
Posts: 184
Quote:
Originally Posted by Bob Miller View Post
Easy Answer, because it stops the crack from moving further. We also would drill a stop hole in Corvette fiberglass cracks before repairing. The strands from the chopper gun will help keep the area intact, but they don't always stop the crack from continuing in the resin.
That worked on my first Corvette, a 1954, and my last Corvette, a 1989, all of which are famous for developing cracks in the fiberglass. Not to mention 2 Meyers Manx's, a Meyers SR-II and about 4 Toyota Sunraders.
This is for cracks in the fiberglass, not spider web cracks, that usually are only in the gelcoat.
BWT: If drilling a 1/8" hole creates a leak problem, fix the crack and the hole, at least the crack won't get bigger.
Sorry, I build Corvettes professionally (for 35 years) and I guess we need to agree to disagree, and I consider this bad advice
__________________
D White is offline   Reply With Quote
Old 08-14-2012, 08:14 PM   #12
Senior Member
 
kirkman's Avatar
 
Name: Jason
Trailer: 2007 Eggcamper & Homemade Tear Drop
New York
Posts: 656
Registry
I build and paddle fiberglass kayaks and I have to agree with D White I would never drill a hole in a crack in fiber glass. I have never had a crack in a fiberglass boat keep progressing.
__________________
kirkman is offline   Reply With Quote
Old 08-15-2012, 12:22 AM   #13
Moderator
 
Name: RogerDat
Trailer: 77 Scamp 13
Michigan
Posts: 3,081
Wouldn't it make a difference how the crack was patched?

I'm thinking that if one is patching the crack by sanding out an area on either side of the crack, laying in mat and resin and essentially rebuilding the structural integrity of the area it would be different than if one was just scaping a shallow V in the crack and filling with resin.

I'm not experienced in FG repar the way some of the poster are but I think the west marine online guide for fiberglass repair suggested the shallow V and resin for minor cracks and suggested drilling a small hole at the crack end.
__________________

__________________
RogerDat is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
So the crack won't be a problem anymore Archie J Problem Solving | Owners Helping Owners 5 04-06-2011 08:28 PM
Structural Crack kyle minor Problem Solving | Owners Helping Owners 2 06-04-2010 11:34 AM
Fiberglass Crack Repair Jay Moeller Problem Solving | Owners Helping Owners 3 05-08-2008 12:08 AM
trillium crack. Ian Harrad Problem Solving | Owners Helping Owners 10 12-12-2006 08:06 PM
creeping crack cure Legacy Posts Problem Solving | Owners Helping Owners 10 05-27-2003 08:40 AM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.