Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 04-06-2011, 08:02   #31
cruiser

Join Date: Sep 2007
Location: Tampa to New York
Boat: Morgan 33 OutIsland, Magic and 33' offshore scott design "Cutting Edge"
Posts: 1,594
Re: Fixing Plastic Freshwater Tank

Quote:
Originally Posted by boatman61 View Post
Mark... the butane torch will be to fierce...


I repeat it worked fine, the heat given off is infinitely variable simply by the distance you hold it from the plastic. This isnt theory or guesswork I did the repair at the BOTTOM of the tank where the pressure is greatest and its held up to 4 years of fulltime liveaboard cruising and many thousands of miles. I found this method online while facing the same problem.
__________________

__________________
forsailbyowner is offline   Reply With Quote
Old 04-06-2011, 08:11   #32
Commercial Member
 
Mark Johnson's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: New Bern NC
Boat: Searunner 34 Trimaran
Posts: 1,565
Re: Fixing Plastic Freshwater Tank

Polyethylene tanks are quite cheep, and the bonds to it somewhere between "so so" and "none". I'd replace it!

Mark
__________________

__________________
Mark Johnson is offline   Reply With Quote
Old 04-06-2011, 08:32   #33
Registered User

Join Date: May 2008
Posts: 1,966
Re: Fixing Plastic Freshwater Tank

I would only use the epoxy idea if the brand specifically claims to work on polyethene. I love Gflex and have found it works pretty well on flame treated HDPE but West specifically warns that G/Flex will not work on polyethylene. Almost all water tanks are polyethylene.

I don't know about you but in my experience the first idea I try never works - one of those boat laws. I always have a backup to the backup.

1. Try melted milk jug or glue stick first. If (when?) it fails you can scrape it off.

2. Get Mr. Sticky to ship to Grenada. I bet he can. I've never seen the stuff but his web site is pretty convincing.

3. Install an access plate in a flat part so you can get your hand in then sandwich a sheet of rubber and a sheet of plastic both inside and outside the tank at the crack. Install bolts all around. Be sure the bolts go through the rubber so it doesn't leak there.

Carl
__________________
CarlF is offline   Reply With Quote
Old 04-06-2011, 09:01   #34
Senior Cruiser
 
osirissail's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
Images: 2
Re: Fixing Plastic Freshwater Tank

Listen to Peg Hall, polyethylene tanks are repaired by welding as she describes. Other fixes are in the category of "quick and dirty" and are ultimately only temporary fixes.
- - If the tank has become brittle then it is time to replace the tank.
- - If you cannot remove or access the area of the tank for welding, then the suggestion to add an "inspection" plate by cutting out the portion of the tank that is split and installing a mechanical sealing plate might buy some time. But if the tank has split of it own accord then that is a sign that the life of the tank has expired and it is likely that further cracks will develop. Replacing the tank is the ultimate fix.
__________________
osirissail is offline   Reply With Quote
Old 04-06-2011, 09:36   #35
Marine Service Provider
 
peghall's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Feb 2011
Posts: 1,533
Re: Fixing Plastic Freshwater Tank

Actually, the weight of the contents puts far more pressure on the sides and top of a tank than on the bottom of it. The contents just sit on the bottom of a tank...and, the bottom is supported as well. They push against the sides of a tank, which are rarely if ever supported on all sides...putting stress on the top as well as they try to expand the tank. Repairing a crack in a side or the top of a tank is rarely successful because the contents immediately starting trying to push it apart again the instant the tank is filled.

So there's a WHOLE lot more to heat welding a seam or a crack in the side or top of a tank than there is in mending one in the bottom of it... and it has nothing in common with simply filling gouges in the bottom of a ski (does that ever bring back memories of entire evenings of Ptex (what amounts to PE glue sticks), ski wax, ironing boards and old irons the night before club races!).

IMO, the least time consuming, least frustrating, least expensive and ONLY permanent fix for a cracked PE tank is a new tank.
__________________
© 2017 Peggie Hall
Specializing in marine sanitation since 1987
Author "The NEW Get Rid of Boat Odors"
https://www.amazon.com/New-Get-Rid-B...dp/1892399784/
peghall is offline   Reply With Quote
Old 04-06-2011, 10:19   #36
Armchair Bucketeer
 
David_Old_Jersey's Avatar

Join Date: Oct 2006
Posts: 10,013
Images: 4
Re: Fixing Plastic Freshwater Tank

If you are going for replacement maybe make an insurance claim - and blame it on a Rogue Wave.
__________________
David_Old_Jersey is offline   Reply With Quote
Old 04-06-2011, 11:12   #37
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Fixing Plastic Freshwater Tank

OK so this is what I bought today.
See photo below.

Propane Torch kit $25
Glue sticks (doesnt say they are Polyethylene) $3.50
Polyethylene tube 1 meter $1

then at a Chandelry
Flex Set Epoxy Bonds Polyethylene (Says to use Flame treating on the Polyethylene) $22
Fibreglass mat $1

So I can have a few experiments and see what works.

I particulalry liked the Polyethylene tube. That should be easy to work with if the glue sticks don't work.

The Torch kit has other uses so that a reasonable buy. The Epoxy if it doesn't work on Polyethylene it might work on Hypolon.


Give me a few days and I'll report back
Attached Thumbnails
Click image for larger version

Name:	IMG_5694.JPG
Views:	145
Size:	298.6 KB
ID:	28068   Click image for larger version

Name:	IMG_5695.JPG
Views:	170
Size:	274.4 KB
ID:	28069  

__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 04-06-2011, 12:30   #38
CF Adviser
Moderator Emeritus
 
Hud3's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,929
Images: 49
Re: Fixing Plastic Freshwater Tank

Good luck, Mark.

I've always believed since my whitewater kayaking days that the only reliable way to mend polyethylene was by welding, but I just found a reference to a new product from TAP called Poly-Weld. If your attempts don't work out, you might want to give it a try, if you can find it.

TAP Poly-Weld Adhesive: TAP Plastics

Here's what they say about it...

Quote:
TAP Poly-Weld Adhesive: Imagine being able to structurally bond Polyethylene!!! This has been virtually impossible in the past. Now, with a simple flame treatment and Poly-Weld, one can create strong joints on Low, Medium, or High Density Polyethylene. The famous marine King StarBoard®, also a polyethylene blend, can now be joined with Poly-Weld! Use for tank, door, pipe, irrigation, pond, marine, float, & automotive body repairs. Also bonds polypropylene, ABS, PVC, ceramics, rubber, fiberglass, metals, and glass. Exterior-rated. Non-sag formula.
__________________
Hud
Hud3 is offline   Reply With Quote
Old 04-06-2011, 12:37   #39
cruiser

Join Date: Sep 2007
Location: Tampa to New York
Boat: Morgan 33 OutIsland, Magic and 33' offshore scott design "Cutting Edge"
Posts: 1,594
Re: Fixing Plastic Freshwater Tank

Be very careful with that, the torch I used was a tiny pencil torch used more for projects like electronic soldering, there is a risk of heating too large an area and the plastic collapsing.$5 at harbor freight.
__________________
forsailbyowner is offline   Reply With Quote
Old 04-06-2011, 13:22   #40
Registered User

Join Date: Dec 2010
Boat: Catalina 30
Posts: 211
Re: Fixing Plastic Freshwater Tank

Quote:
Originally Posted by Hud3 View Post
Good luck, Mark.

I've always believed since my whitewater kayaking days that the only reliable way to mend polyethylene was by welding, but I just found a reference to a new product from TAP called Poly-Weld. If your attempts don't work out, you might want to give it a try, if you can find it.

TAP Poly-Weld Adhesive: TAP Plastics

Here's what they say about it...
I posted a video from TAP above. It seems thorough.
__________________
allanpeda is offline   Reply With Quote
Old 04-06-2011, 17:13   #41
Registered User
 
Nauticatarcher's Avatar

Join Date: Jun 2007
Location: Mooloolaba, Qld
Boat: Islander Freeport 36
Posts: 396
Re: Fixing Plastic Freshwater Tank

make sure you bevel edges of crack before welding
__________________
Nauticatarcher is offline   Reply With Quote
Old 04-06-2011, 17:44   #42
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Fixing Plastic Freshwater Tank

Quote:
Originally Posted by Hud3 View Post
Good luck, Mark.

I've always believed since my whitewater kayaking days .
this tube of goop actually has a drawing of a kayak on the front so it must work

Maybe its you in the drawing!!


Mark
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 15-06-2011, 07:42   #43
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Fixing Plastic Freshwater Tank

Updated news.

I have done the repair. But don't know till I fill the tank if the repair is effective (or for how long)

I used the technique in post #6 from Allanpeda in the video posted. It uses heat treating the polyethelene.

Also I blobbed on a few test dollops. They have stuck pretty well but they can be sctratched off. Maybe a few more days hardening, maybe it will be fine in the larger repair.

Mark
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 15-06-2011, 07:55   #44
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,770
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: Fixing Plastic Freshwater Tank

mark--if it works, come on over and i will buy the beer and ye can help me with my kayak--has a hole in end......LOL......
zeehag is online now   Reply With Quote
Old 15-06-2011, 08:10   #45
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Fixing Plastic Freshwater Tank

Quote:
Originally Posted by zeehag View Post
my kayak--has a hole in end......LOL......
Of course it does. Thats where you sit.




yes, you're on for the beer
__________________

__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
Fixing Stainless Water Tank seashine Plumbing Systems and Fixtures 22 26-03-2013 06:33
Fixing a Fuel Tank Leak Ziggy Engines and Propulsion Systems 6 05-01-2011 21:21
Trinidad - Plastic Tank Fabricator ? Sonosailor Plumbing Systems and Fixtures 2 02-08-2010 05:36
looking for (custom?) plastic tank for our diesel lancs Construction, Maintenance & Refit 8 18-03-2009 15:45



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:58.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.