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| Re: [GMCnet] Waste tank repairs [message #339712 is a reply to message #339711] |
Sun, 23 December 2018 15:09   |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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40+ year old plastic is nothing like modern plastic. There are softening
agents
(plasticizers) that have outgassed and left the building years ago, leaving
behind a brittle, fragile, shell. It can be repaired in the spots you find,
only to fail in another. In the interest of peace of mind, my
recommendation is to replace, not repair your tanks. But, if you are money
challenged, the tanks can be repaired with various methods. Among them are
plastic welding, solvents that melt and bond existing pieces, and patches
that are glued into place. If you are dealing with punctures, sometimes
tapping stainless steel screws and sealing washers can be used. Each case
is going to dictate repair methods used. Cleanliness is next to Godliness,
and DRY is the name of the game.
Jim Hupy
Salem, Or.
On Sun, Dec 23, 2018, 12:42 PM Peter Faxon Does anyone have experience with using ruberized spray to seal connections[/color]
> and cracks in waste tank and valve.
> We get somewhat less than 1/2 full before we start to leaking. Messy and
> embarassing.
>
> --
> *Pete Faxon*
> *1974 Glacier*
>
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| Re: [GMCnet] Waste tank repairs [message #339720 is a reply to message #339718] |
Mon, 24 December 2018 01:22 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Had mine plastic welded on the coach about 12 years ago. Cost me $25.00 and 10 minutes time. Did the same on a plastic gas tank on my Blazer after my daughter ran a piece of steel through it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Waste tank repairs [message #339723 is a reply to message #339711] |
Mon, 24 December 2018 07:04 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I repaired the breaks around the outlet in my 23' using fiberglas cloth as resin. Thorough dleaning, an alcohol wash to remove any remaining water, and overnight dry. My hands are small enough to reach into the tank through the outlet hole, so I laid the cloth up that way. I suspect that if you removed it and took some time you could roll a layer of fiberglas cloth over the entire tank and reinstall it. I defer however to those of you who have greater experience with fiberglassing stuff than I.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Waste tank repairs [message #339741 is a reply to message #339711] |
Tue, 25 December 2018 08:09 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Peter Faxon wrote on Sun, 23 December 2018 15:41Does anyone have experience with using ruberized spray to seal connections and cracks in waste tank and valve.
We get somewhat less than 1/2 full before we start to leaking. Messy and embarassing.
--
*Pete Faxon*
*1974 Glacier*
Pete,
Sorry I missed this opening, but this is not a time that I stay close to the keyboard.
Having repaired my own black tank of both physical and age damage, I can tell you that your best bet is to try to hunt up a plastic fabricating shop. If you can find one that will weld the tank, that is a very good way to go. Yes, you will have to take the tank down to do this right, but it will be worth the effort in the longer term.
That tank (if it is OE) is polypropylene. In its normal state, nothing will bond to it. I can suggest that you do a websearch for "flame treating plastics". This is a technique can render the surface non-poly-whatsis and allow things to bond.
Matt
I do not know about the spray on rubber products, but I do know the West System (not related to Waste Marine, but available there) and they now have a flexible epoxy that some have used to make successful repairs to polyXX tanks. While I have not yet used this family of products, I know the company well enough to expect it to be good at what they say it will do.
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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