| Rooftop AC cover becoming fragile [message #334074] |
Wed, 27 June 2018 03:33  |
GatsbysCruise
Messages: 261
Registered: January 2017
Location: Waukegan, Illinois
Karma: 3
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Senior Member |
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So I was up top of the GMC and scrubbing the roof down to remove the dirt and the organic like growth that starts to grow up there. This growth starts out as a black spot and gets bigger, will actually look like a miniature volcano. The problem I found with this microbe is it actually eats into the paint and when you scrape it away, you can see where the paint has been damaged.
So when i am by the AC, I put my hand on the cover by the top edge and I hear a crack sound. Looking at the plastic I can see a slight crack. The cover is in the sun all day and that has appearantly taken a toll on the strength of the plastic media.
-- Does anyone know how to reinforce the cover to attempt a save? I don't have any broken pieces yet.
I was thinking that painting the outside of the AC cover white would help stay the heat damage but I don't know if epoxy with fiber cloth will stick to this type of plastic. I need to do something even if using a roofing tape and taping along all the edges inside the cover to prevent it from falling apart.
-- Anyone have any ideas or is replacement the only answer.
Thanks
s
GatsbysCruise. \
74GMC260 Former Glacier Model style. \
Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center
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| Re: Rooftop AC cover becoming fragile [message #334075 is a reply to message #334074] |
Wed, 27 June 2018 03:49  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I did the same thing one time. I was up there and leaned on the cover and broke it badly. I was leaving the next day for Rapid City and Estes Park for a few weeks so I got out the fiberglass tape. I have a roll of 2.5" wide of 80%/20% tape. I cleaned up the cover and glassed some of that tape in place. That was about 12 years ago and it is fine. I probably ought to go up there and paint it some day but no one sees what is on top of the coach.
Last fall I just did the same thing to three badly damaged Hammond vent covers on another coach I'm working on. I also did not paint them. I guess I ought to.
So I suggest some fiber glass and some epoxy to fix it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Rooftop AC cover becoming fragile [message #334077 is a reply to message #334074] |
Wed, 27 June 2018 06:36 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Senior Member |
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Depending on what A/C you have, you would probably be better off with a new cover.
I have done the epoxy / FG repair when I was a tech. It requires a lot of prep , adds considerable weight, and outer cracks will still form
76 Glenbrook
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| Re: [GMCnet] Rooftop AC cover becoming fragile [message #334086 is a reply to message #334077] |
Wed, 27 June 2018 10:20 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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at least fix the cracks. Any crack will suck water into the coach, the waters surface tension just draws it in right through the crack!
________________________________
From: Gmclist on behalf of Chris Tyler
Sent: Wednesday, June 27, 2018 6:36 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Rooftop AC cover becoming fragile
Depending on what A/C you have, you would probably be better off with a new cover.
I have done the epoxy / FG repair when I was a tech. It requires a lot of prep , adds considerable weight, and outer cracks will still form
--
76 Glenbrook
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Rooftop AC cover becoming fragile [message #334103 is a reply to message #334086] |
Wed, 27 June 2018 14:39 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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When I first got my coach, when I opened up the roof box, it was 1/4 of the
way full of water. Traced it back to cracks in the lid. Removed the lid,
laid it on a work table, and got after the inside with an orbital sander
with 100 grit. Scuffed up the surface, and painted on some polyester resin
on the cracked areas, followed by fiberglass matte scraps, foam rollered to
remove air bubbles. 24 hour cure with infrared lamps. Strong, and no leaks.
I also scuffed the outside, filled the cracks with long n strong, a filled
polyester bondo like product. Sanded it, and painted it with Duplicolor
shake n shoot for plastic. Looked great last time I was up there a couple
of years ago.
Jim Hupy
On Wed, Jun 27, 2018, 8:21 AM Keith V wrote:
> at least fix the cracks. Any crack will suck water into the coach, the
> waters surface tension just draws it in right through the crack!
> ________________________________
> From: Gmclist on behalf of Chris Tyler dtyler11@tampabay.rr.com>
> Sent: Wednesday, June 27, 2018 6:36 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Rooftop AC cover becoming fragile
>
> Depending on what A/C you have, you would probably be better off with a
> new cover.
>
> I have done the epoxy / FG repair when I was a tech. It requires a lot of
> prep , adds considerable weight, and outer cracks will still form
>
>
> --
> 76 Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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