Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 03-06-2011, 17:32   #16
sitting on the dock of the bay

Join Date: Mar 2006
Posts: 1,513
Images: 6
Send a message via Yahoo to gonesail
Re: Fixing plastic freshwater tank

west marine says the new flexible epoxy will stick to plastic.
__________________

__________________
sometimes the things that may or may not be true are the things a man needs to believe in the most.
gonesail is offline   Reply With Quote
Old 03-06-2011, 19:29   #17
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 steamgoat View Post
Why not cut a hole in the tank where the crack is and fit a round plastic tank access panel,the type they fit to clean out tanks ??
Because its in a bit thats curved.

Quote:
Originally Posted by Vasco View Post
One thing good about the tanks in a 393, they're quite easy to remove. It might be worth your while to get a replacement, Mark.
Yes, and its the forward tank which can be whipped out pretty easy. But, being a cheapskate, I'll try a repair first.

I have a few days to think about it..... i.e. I need to drink a lot of water first

Then I am thinking... OK don't laugh:
1) Buying a small butane burner that they use in kitchens to do Creme Brulee and welding a bit of milk bottle container(etc) to the crack.

2) Cyanoacrylate and Sodium Bicarbonate. Put Bi Carb of Soda in the crack and pour Superglue on it. Heats the plastic and burns the putty in.

3) Boiling Beer for my coffee for the rest of my life.


The Tap Poly Weld as shown in that video looks good, but I doubt I can buy it here in Grenada.

But there are threat thoughts from everyone on a problem that I thought would be an easy fix.

Nothing is an easy fix on a boat!





Mark
__________________

__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 03-06-2011, 20:42   #18
Registered User
 
sabray's Avatar

Join Date: Aug 2008
Location: Wash DC
Boat: PETERSON 44
Posts: 3,169
Farley mowat might suggest backing it into a good mud bank. If it sacrificial water.
I'm just no help here. I liked the melted milk jug idea. If you got a butter knife hot enough maybe you could batter it all well enough. It probably cracked for a reason. If I were battering it up u might look at why it cracked there what's holding it in place . Some point is going to come along and you'll want to replace it. So maybe you get to choose when and where.
__________________
sabray is offline   Reply With Quote
Old 03-06-2011, 22:50   #19
Marine Service Provider
 
peghall's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Feb 2011
Posts: 1,533
Re: Fixing plastic freshwater tank

What KINDS of plastic? And for how long? PVC is plastic...PP is plastic...Lexan is plastic...Eisenglas is plastic...the list is endless. The fact that something will stick to one of 'em--or even most of 'em--does not guarantee it'll stick to all of 'em. And even if it does, is it permanent? Nobody's come up with anything yet that will bond to PE permanently...3M came out with some stuff about 10 years ago that was supposed to...and it did...but only for a few weeks.
__________________
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 online now   Reply With Quote
Old 03-06-2011, 23:35   #20
Registered User
 
sww914's Avatar

Join Date: May 2009
Location: Punta De Mita
Boat: Vagabond 39 Hull # 1
Posts: 1,842
Re: Fixing plastic freshwater tank

I've welded it successfully on kayaks and car bumpers. I took a class and had the special tool for the bumpers, on the kayak I used a propane torch to pre-heat the plastic and I found shoe that fit my butane soldering iron. For a scrap of plastic to weld into the gap I trimmed a bit off of an edge that wasn't necessary. If you need a scrap you can install another access plate and use the part that you've removed as material. You can tell if it's PE or PP, one floats in water and one sinks but I can't remember which is which.
I tried special epoxy to repair an RV water tank, that's a load of crap. It worked for a few weeks and the original design flaw reappeared. What a waste of time & money. I'd rather get my eye tattooed than do that again.
__________________
Steve
http://www.landfallvoyages.com
sww914 is offline   Reply With Quote
Old 04-06-2011, 04:08   #21
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

I repaired mine with a pencil torch and high strength hot melt glue sticks. Th e glue sticks are made of polyethylene and did a fine job of it. Just weld like gas welding , starting a puddle and feeding the glue stick into the puddle as you progress with the weld.
__________________
forsailbyowner is offline   Reply With Quote
Old 04-06-2011, 05:20   #22
Registered User
 
Beach Cruiser's Avatar

Join Date: Apr 2004
Location: Cruising
Boat: Victory V35 - Beach Cruiser
Posts: 87
Re: Fixing Plastic Freshwater Tank

Take a look at West Systems G/Flex 655 epoxy. It is formulated for plastics. They show a video of a kayak they cut i half and epoxied back to together. I used it to repair a crack in the salon window of my catamaran.
__________________
Barry
s/v Beach Cruiser
Beach Cruiser is offline   Reply With Quote
Old 04-06-2011, 05:39   #23
Freelance Delivery Skipper..
 
boatman61's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Jan 2010
Location: UK/Portugal
Posts: 20,203
Images: 2
Send a message via Skype™ to boatman61
pirate Re: Fixing Plastic Freshwater Tank

Mark... the butane torch will be to fierce... what you need to get hold of is a paint peeling gun... the electric ones that look like a hair dryer... then cut the milk bottle into strips... heat the area round the crack with the gun till tacky then lay the strips one at a time and melt into the tacky tank... the bottle material will melt quicker than the thicker area so just build up a strip at a time....
__________________


Born To Be Wild
boatman61 is offline   Reply With Quote
Old 04-06-2011, 06:31   #24
Armchair Bucketeer
 
David_Old_Jersey's Avatar

Join Date: Oct 2006
Posts: 10,013
Images: 4
Re: Fixing plastic freshwater tank

Quote:
Originally Posted by steamgoat View Post
Why not cut a hole in the tank where the crack is and fit a round plastic tank access panel,the type they fit to clean out tanks ??
I like the access panel approach (as would fit in with Plan B - drop a flexible tank in ). Curved makes it awkward - but not insurmountable. I would be thinking of making an (epoxy?) collar to give something flat to fix the access panel to (could probably DIY something).

Score 1 for Beneteau if the water tank is easily removable
__________________
David_Old_Jersey is offline   Reply With Quote
Old 04-06-2011, 06:34   #25
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 sww914 View Post
I'd rather get my eye tattooed than do that again.
Thats one I haven't heard.




I'll check out the glue sticks idea too
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 04-06-2011, 06:36   #26
Registered User

Join Date: Aug 2008
Posts: 238
Re: Fixing Plastic Freshwater Tank

Let me find that part number for you. I had a car with a plastic radiator and it cracked. I called 3M and they sent me a flexible epoxy that not only stopped the leak but withstood 15 PSI. It never leaked again. It was dark gray and stuck like glue. I'll post back when I find it. I've got it stored somewhere on my hard drive.
__________________
Failure is most often times a temporary condition........
Giving up is what makes it permanent.



Bill Burgette is offline   Reply With Quote
Old 04-06-2011, 06:39   #27
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 David_Old_Jersey View Post
Score 1 for Beneteau if the water tank is easily removable
Yeah, its under the forward cabin bunk so its just a few screws to take the bed boards out and 2 bolts, plus the hoses etc.
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 04-06-2011, 06:51   #28
Registered User

Join Date: Dec 2010
Boat: Catalina 30
Posts: 211
Re: Fixing plastic freshwater tank

Quote:
Originally Posted by David M View Post
Google "Polyethylene water tank patch". There are plenty of sources to choose from.

I also found this...
http://www.mrstickys.com/products/POLY-TANK-REPAIR-KIT-(MANUAL-MIX).html

I would rough it up with some 40 to 60 grit to get a better physical bond.
The instructions also mention the flame pre-treatment noted as essential in the video above.
__________________
allanpeda is offline   Reply With Quote
Old 04-06-2011, 07:04   #29
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Re: Fixing plastic freshwater tank

Quote:
Originally Posted by Astrid View Post
It might be worth looking at this site as well for some more ideas:
Plastic welding, plastic welding tools, plastic welding equipment, kits, rods and supplies.
I think plastic welding is the best way to fix a crack in polyethylene.

Quote:
Originally Posted by Astrid View Post
Your best bet would be to patch it rather than attempt to fill in the crack.

1. drain the tank.
2. Roughen up the area around the crack or tear and drill a small hole at each end of the crack as an arrestor.
3. cut a fiberglass material patch larger enough to cover the crack with a 5cm margin
4. coat the area around the crack liberally with epoxy so that the coated area is slightly larger than the patch.
5. Lay the patch in place and coat the patch and surrounding area with epoxy.
6. allow to cure and set before refilling the tank.
Flexible epoxy (like West System G-Flex) may work. An essential preparation step to ensure adhesion is to flame treat the plastic (see here for instructions). Without flame treatment it's likely the repair will fail.
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
Ziggy is offline   Reply With Quote
Old 04-06-2011, 07:59   #30
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,745
Images: 9
Freshwater Tank Sandwhich

Quote:
Originally Posted by MarkJ View Post
Well, at least I have found the problem!!

One of my plastic water tanks has a 3 cm (1.5 inch) crack in it and its piddling water when its full.

I 'fixed' it a few months ago with a hard epoxy putty. However the instructions must have been wrong

What would you do to fix it 'properly'?

I am thinking a nice splatter of my silicon sealant. But knowing boats I thought I better ask....


Mark
one more idea here. cut a rectangular hole in the tank. Take 2 pieces of 1/4" starboard (HDPE plastic) heat it to conform to the shape of the tank using a paint strip heater. Make sure that one piece can slip inside the rectanuglar hole. Take the two pieces of plastic and stack them on on the other and clamp them . Then drill pilot holes (that don't go all the way thru) for stainless steel screws and place the screws in the plastic using screws of a length that they don't penetrate the bottom piece. Remove screw and find two holes on opposite sides of the plastic and continue the pilot holes all the way thru the plastic. Use one piece of the plastic as a template and drill over size holes in the tank so that the screws will not grab the tank. Next on the holes that were drilled all the way thru insert a piece of strong fishing line down one hole in the plastic and up the other so that it supports the bottom. Feed the fishing lines thru the tank and thru the top piece of plastic. Use the fishing line to apply tension on the plastic while inserting screws. When all but the last two holes are done pull the fishing line thru. Apply the last two screws.

On re read you may want to insert a gasket in the sandwich.

I would think you could source all of this stuff locally but if you need some 1/4" plastic let me know and I can ship you some small pieces for the cost of shipping.
__________________

__________________
Fair Winds,

Charlie

Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie 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 20:21.


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.