Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-31-2009, 03:40 PM   #1
Rivet Master
 
JimGolden's Avatar
 
Vintage Kin Owner
1977 31' Excella 500
Berkeley Springs , West Virginia
Join Date: Sep 2005
Posts: 1,619
Images: 7
What glue should I use to fix a small crack in my freshwater tank?

Hi everyone,

I have discovered the source of the small leak in my fresh water tank. My tank is L-shaped and at the top of the tank in the inside of the L-angle, I found a very fine crack in the tank.

I discovered this very scientifically; I took my shop vac, hooked the hose to the blower side, made a funnel out of a 2L pop bottle, then lightly pressurized the tank. Had my wife hold the funnel and hose assembly to the fresh water inlet door and I went inside and reached through an access door to find where the air was coming from. The low pressure air worked like a charm

So my tank is the standard white plastic material. I would guess it is polyethylene or polypropylene. What glue should I use to fix this hairline crack? 2-part epoxy? PVC cement? Model airplane glue? I don't have easy access to a plastic welder either. Would prefer to just glue it shut if possible.

There's really not much room to glue another piece of patch over it. I don't think that I really need a patch; the crack isn't even visible to the eye. But you can feel air coming through it. The leak was about a drop every 15 seconds, but I lost probably 10 gallons over a weekend and it's not good for the floor/belly pan. I want to fuse the plastic shut.

I am fortunate in where the leak is located. It is relatively easy to get at. I just need to find out what the right glue is for this. Any help would be appreciated.

thanks!
__________________

__________________
- Jim
JimGolden is offline   Reply With Quote
Old 05-31-2009, 04:03 PM   #2
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by JimGolden View Post
Hi everyone,

I have discovered the source of the small leak in my fresh water tank. My tank is L-shaped and at the top of the tank in the inside of the L-angle, I found a very fine crack in the tank.

I discovered this very scientifically; I took my shop vac, hooked the hose to the blower side, made a funnel out of a 2L pop bottle, then lightly pressurized the tank. Had my wife hold the funnel and hose assembly to the fresh water inlet door and I went inside and reached through an access door to find where the air was coming from. The low pressure air worked like a charm

So my tank is the standard white plastic material. I would guess it is polyethylene or polypropylene. What glue should I use to fix this hairline crack? 2-part epoxy? PVC cement? Model airplane glue? I don't have easy access to a plastic welder either. Would prefer to just glue it shut if possible.

There's really not much room to glue another piece of patch over it. I don't think that I really need a patch; the crack isn't even visible to the eye. But you can feel air coming through it. The leak was about a drop every 15 seconds, but I lost probably 10 gallons over a weekend and it's not good for the floor/belly pan. I want to fuse the plastic shut.

I am fortunate in where the leak is located. It is relatively easy to get at. I just need to find out what the right glue is for this. Any help would be appreciated.

thanks!
Glue is a no-no.

For a quick repair, for a "small" crack, fuse it back together with a small "soldering iron." Or, melt some of the same material, scuff the surface, and pour it on.

That tank is a crazy design and it's been obsolete for 30 plus years, so be careful.

I have the drawing for it and no one wants to get involved making it again, unless you order 25 or more.

Andy
__________________

__________________
Inland RV Center, In is offline   Reply With Quote
Old 05-31-2009, 11:44 PM   #3
3 Rivet Member
 
somefun's Avatar
 
1974 27' Overlander
Puyallup , Washington
Join Date: Apr 2003
Posts: 124
I'm getting ready to repair some cracks in my black water tank (low density polyethylene), and I'll be using Scotchweld 8005. I should know how it worked by this time next week. Copy and paste the following into the search box on Google for some good info on this product:
site:www.airforums.com scotchweld
__________________
somefun is offline   Reply With Quote
Old 06-01-2009, 09:15 PM   #4
Rivet Master
 
SteveH's Avatar
 
2005 39' Land Yacht 390 XL 396
Common Sense , Texas
Join Date: Sep 2007
Posts: 5,311
I've had good luck with Household Goop for such uses. It's a very thick silicone that hardens well, and is waterproof.
__________________
SteveH is offline   Reply With Quote
Old 06-11-2009, 05:22 PM   #5
Rivet Master
 
JimGolden's Avatar
 
Vintage Kin Owner
1977 31' Excella 500
Berkeley Springs , West Virginia
Join Date: Sep 2005
Posts: 1,619
Images: 7
Scotch Weld works great!

Hey Gang,

Just a final report on my tank repair. I looked into that 3M Scotch Weld DP-8005 and it looks to be the only glue in the world made for polyethylene. I couldn't even find it locally. So....I looked online and saw that it was $30 for a tube of it and about another $40 for the applicator tube. So.....I called up a guy I know who is a 3M rep and said "How 'bout a sample?" Dude hooked me up

I cut a thin piece of polyethylene about 1" by 2" by 1/4". Cleaned both the tank and the new piece with alcohol, let it dry, then glued her up. 24 hours later I did my air pressure test and it held just fine. Filled her up and no leaks. It's been holding for days now.

So anyway, if you don't have a hot air plastic welder or other similar tools or access to the place is tight, I think this product from 3M will work just fine. It seems to be a great product. Even if you had to pay the full fare, I think it'd be worth it.

See ya on the road,
__________________
- Jim
JimGolden 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
replacement freshwater tank?? slvrbulit Fresh Water Systems 2 04-17-2009 09:10 PM
Can I fix a crack this big in a bathroom counter? 2Alaska Cabinets, Counter Tops & Furnishings 21 11-06-2008 09:35 PM
I don't want to melt freshwater tank bertro Repairing/Replacing Floor &/or Frame 3 04-11-2008 07:34 PM
How can you tell if your freshwater tank is truly clean? JimGolden Fresh Water Systems 24 10-30-2007 09:44 AM
Is something wrong with my freshwater tank? TitusLivy Fresh Water Systems 11 04-28-2007 10:15 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:09 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.