| GMC Roof Leak Repair - The "Pac-Man" Patch [message #356893] |
Fri, 17 July 2020 12:55  |
Clark76
Messages: 62
Registered: February 2010
Karma: -2
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GMC Roof Leak Repair – “The Pac-Man Patch” July, 2020
One day driving down the highway, my fiberglass roof-top carrier opened up. In doing so, the internal frame bent. I also found out shortly thereafter that I had a roof leak. What I discovered was that when the top popped opened towards the driver’s side, it lifted up the right rear (passenger side) of the carrier and popped the bolt through the roof. Or it appeared so. I now believe the bolt on the inside of the roof had come loose, and it just lifted it up a-ways breaking whatever former seal existed and now a point of entry of water into the coach.
Long story short, I repaired this leak successfully externally on the roof by creating a "Pac-Man" patch out of a rubber membrane (gasket material)and adhering it to the roof with rubber sealant Without removing the roof-top carrier, or taking down my ceiling in the coach. Post installation torrential rain and NO LEAK! Yea!
Simple cheap fix - Temporary or possibly permanent - we'll see.
See Photo's and How-To instructions on my GMC Photo's Album Site link below. (also Printable .PDF document)
http://www.gmcmhphotos.com/photos/g7312-the-pac-man-patch.html
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| Re: GMC Roof Leak Repair - The "Pac-Man" Patch [message #356897 is a reply to message #356893] |
Fri, 17 July 2020 14:12  |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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This topic is hitting on a question I had too. Is there a recommended way to patch holes made in roof? I have a old TV antenna and CB antenna that would like to remove. In doing that it would leave the bolt hole penetrations. Was wondering how best patch and seal those holes?
TG
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] GMC Roof Leak Repair - The "Pac-Man" Patch [message #356899 is a reply to message #356897] |
Fri, 17 July 2020 14:46 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Tom,
After applying a variety of methods (welded patch, epoxy) I believe
applying a patch from the backside of the panel aluminum or smc to be the
best. Modern two part epoxies available today are quick and lasting and
since you are patching from the underside offer minimum disturbance to the
visible side. Welding the aluminum roof sheet can result in distortion of
the sheet and turn a small issue into a large one quickly. It is much
easier to fabricate a patch panel and bond it to the backside with a
support beneath the patch to secure it in place until the epoxy has set. If
you have a cross bonding adhesive practically anything can be bonded to
anything. For holes in the aluminum sections I used patch panels of
aluminum and for the smc panels I used polycarbonate. The cross bonding
adhesive i used is 3m 8115 which requires a specific type of applicator.
Whichever type of bonding agent you choose I would not choose a single
component adhesive. You want a two part catalyzed adhesive. Once your
structural patch has set you can fill the pretty side with your favorite
filler and contour to paint.
Sully
Bellevue wa.
On Fri, Jul 17, 2020 at 12:13 PM tom geiger via Gmclist <
gmclist@list.gmcnet.org> wrote:
> This topic is hitting on a question I had too. Is there a recommended way
> to patch holes made in roof? I have a old TV antenna and CB antenna that
> would like to remove. In doing that it would leave the bolt hole
> penetrations. Was wondering how best patch and seal those holes?
>
> TG
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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