| [GMCnet] Holding tank crack repair [message #221838] |
Mon, 09 September 2013 18:58  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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One possible cure is to use SEM Plastic Prep spray followed by E6000 adhesive. No guarantees, but it has worked on my tank issues so far. I have had a persistent leak in the gray water tank on the Royale for as long as we have owned it (11 years and counting). I tried most everything. The special black tank epoxy stuff appeared to work for a while but the flexing in the outlet pipe on the end of the gray tank eventually caused it to fail as well. Recently I tried the cocktail of SEM Plastic Prep followed by the E6000 and so far that appears to be holding well. The E6000 is used like a caulk, with a thick bead built up all around the pipe in stages. Too soon to say whether it is a long term fix, but so far so good.
Jerry
Jerry and Sharon Work
78 Royale rear lounge
77 Clasco
Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 8
Date: Mon, 09 Sep 2013 14:47:40 -0500
From: John R. Lebetski <gransport@aol.com>
Subject: Re: [GMCnet] Holding tank crack repair
To: gmclist@temp.gmcnet.org
Message-ID: <36258.522e25dc@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="ISO-8859-15"
Thanks Emery. I'm attempting a repair. Sanded 60 grit, wiped with alcohol. Doing Loctite plastic bonder epoxy, 2 coats, then Gardner leak stopper clear patch in caulk tube as that's flexible, then going to spray area with Mighty Sealer. If that doesn't work, then sand off and go to Terry the plastic welder in Chesterton In. Camping World would only replace ( and didn't get to the 77 GMC part) and General would apply some patch so trying that myself. Need a new tank but wish we had a Jim K by Chicago. Polypropylene has that Teflon like property
--
John Lebetski
Chicago, IL
77 Eleganza II
Source America First
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Holding tank crack repair [message #221889 is a reply to message #221858] |
Tue, 10 September 2013 09:08  |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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Something I have found true over the years of messing with these, as polypropolene gets old and deteriorates is shrinks. Cracks for from stress mainly around fittings, corners and folds, fix them and the cracks continue. I used to plastic weld them but found cracks in other places and others continue to grow. It's the stress that forms them. You ask, "What's the 1/2 life of this material?" Survey says about now! It is short $ to try it but don't think Murphy is picking on you if the crack continues or another one forms. "To everything turn, turn, turn-- There is a season turn, turn, turn...
Put a 1/2 plywood surround to help hold the pressure off the plastic, I do this on the new tanks we install.
Jim Bounds
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________________________________
From: "Hobden, Phil" <phil.hobden@doerfer.com>
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Sent: Tuesday, September 10, 2013 1:34 AM
Subject: Re: [GMCnet] Holding tank crack repair
Coming out of lurk mode for a moment....
I found something new at Tap Plastics in San Jose this summer that worked well on a fresh water tank crack on a trailer -- they now have an adhesive under their own brand name that works with Polypropylene tanks. Tried a lot of the other adhesives just to get thru a season of camping -- concerned about and always using adhesives that said they were safe for water -- but they would peel off eventually... This polypro stuff from Tap Plastics held! I have had to work w a lot of plastic mfg'ing for work thru the years and polypro is known to not be adhesive friendly -- you must always do a weld repair. I could not source ploy pro welding rod in time, so tried the Tap Plastics product. It's a process to install. You have to use a propane torch to warm up the tank material and use fiberglass cloth to reinforce. And its around $15 a tube. The guy at the store said it contains polypro and the heat excites the molecules enuf to allow a bond. The
samples he showed me I could p
eel off. Would suggest giving it a try unless you have access to polypro welding rod and a heat gun.
Hope that helps!
Phil H --- still searching for our 1st GMC
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| Re: [GMCnet] Holding tank crack repair [message #221971 is a reply to message #221889] |
Tue, 10 September 2013 16:33 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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A big part of the problem is that when polymer products such as tanks, auto dash covers, etc. are made they contain something called plasticizers. There are chemical oils that keep the plastic flexible. As the plastic ages it gets brittle and starts cracking. Even trying to plastic weld it won't make the material flexible again.
How many of you have seen cracked dashes in cars or seat that begin to crack?
The "new car smell" is really the plasticizers that eventually evaporate from the plastic parts.
Emery Stora
On Sep 10, 2013, at 8:08 AM, Jim Bounds wrote:
> Something I have found true over the years of messing with these, as polypropolene gets old and deteriorates is shrinks. Cracks for from stress mainly around fittings, corners and folds, fix them and the cracks continue. I used to plastic weld them but found cracks in other places and others continue to grow. It's the stress that forms them. You ask, "What's the 1/2 life of this material?" Survey says about now! It is short $ to try it but don't think Murphy is picking on you if the crack continues or another one forms. "To everything turn, turn, turn-- There is a season turn, turn, turn...
>
> Put a 1/2 plywood surround to help hold the pressure off the plastic, I do this on the new tanks we install.
>
> Jim Bounds
> --------------------
>
>
> ________________________________
> From: "Hobden, Phil" <phil.hobden@doerfer.com>
> To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
> Sent: Tuesday, September 10, 2013 1:34 AM
> Subject: Re: [GMCnet] Holding tank crack repair
>
>
> Coming out of lurk mode for a moment....
>
> I found something new at Tap Plastics in San Jose this summer that worked well on a fresh water tank crack on a trailer -- they now have an adhesive under their own brand name that works with Polypropylene tanks. Tried a lot of the other adhesives just to get thru a season of camping -- concerned about and always using adhesives that said they were safe for water -- but they would peel off eventually... This polypro stuff from Tap Plastics held! I have had to work w a lot of plastic mfg'ing for work thru the years and polypro is known to not be adhesive friendly -- you must always do a weld repair. I could not source ploy pro welding rod in time, so tried the Tap Plastics product. It's a process to install. You have to use a propane torch to warm up the tank material and use fiberglass cloth to reinforce. And its around $15 a tube. The guy at the store said it contains polypro and the heat excites the molecules enuf to allow a bond. The
> samples he showed me I could p
> eel off. Would suggest giving it a try unless you have access to polypro welding rod and a heat gun.
>
> Hope that helps!
>
> Phil H --- still searching for our 1st GMC
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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> GMCnet mailing list
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