Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 20-09-2009, 04:15   #1
Registered User

Join Date: Sep 2009
Posts: 8
Ferro Cement Hull Repair - Curing in the Ocean?

hi all
we have to do a repair job on our ferro hull under the waterline, and have been told that it is actually possible to launch the boat straight after, hence letting the cement cure in the saltwater. the repair job is over a fairly big area on the keel. has anyone got any experience with saltwater curing?
All sincere advice is appreciated and again if you are a ferro hater, don't worry commenting!
thank you
__________________

__________________
popeyecrew is offline   Reply With Quote
Old 20-09-2009, 04:48   #2
Registered User
 
mesquaukee's Avatar

Join Date: Jun 2009
Location: Western Caribbean & ocassionaly inCanada
Boat: Mesqua Ukee, Buccaneer 40 (Salar 40)
Posts: 480
There should not be a problem as long as the concrete has set (not cured).
I assume you have painted it.
__________________

__________________
mesquaukee is offline   Reply With Quote
Old 20-09-2009, 15:16   #3
Registered User

Join Date: Sep 2009
Posts: 8
curing ferro hull

hi there
thanks for your reply. we haven't done the job yet, because we want to be sure to do it right before we start. someone actually told us that it can be painted after it has been in the water again, like a year after..... what is your take on that?
thanks for your help
__________________
popeyecrew is offline   Reply With Quote
Old 21-09-2009, 02:41   #4
Registered User
 
mesquaukee's Avatar

Join Date: Jun 2009
Location: Western Caribbean & ocassionaly inCanada
Boat: Mesqua Ukee, Buccaneer 40 (Salar 40)
Posts: 480
Type V Portland cement is better than the more common type III. It is much more resistant to saltwater (akaline) than the type III. The commonest mistake is adding too much water to make the mix more workable, this results in a low strenght concrete with a lot of surface problems. The stiffer the better. Adding PVA to the mix makes it bond better.
Putting it in the water right after setting up is a good idea as it prevents any surface cracking due to drying out (evaporation not curing). I am not so sure about the salt though, some type of barrier would be an idea to prevent salt from leaching in to the surface layers. You may want to slap on multiple coats of PVA before in goes into the water. It drys fast as the water in it will be absorbed by the concrete. One source of cheap PVA is primer paint for sealing new drywall, it comes in 5 gallon buckets (it should say PVA on the label).
I must add I am not a ferrocement boat person, I have just been around a lot of concrete.
__________________
mesquaukee is offline   Reply With Quote
Old 21-09-2009, 04:31   #5
Registered User

Join Date: Sep 2009
Posts: 8
hi there,
thank you so much for taking your time to reply to my questions. i am amazed how helpful everybody on this forum is. i have already learnt a lot, and once i feel a bit more competent i will happily share my knowledge as well!
happy sailing!
__________________
popeyecrew is offline   Reply With Quote
Old 26-09-2009, 21:37   #6
Registered User
 
Martinini's Avatar

Join Date: Jul 2008
Location: Where ever my boat is.
Boat: Allied Princess 36'
Posts: 257
Cement will cure just fine in water, if it didn't all those bridges wouldn't be possible. It actually strengthens with age.
__________________
Martinini is offline   Reply With Quote
Old 03-10-2009, 23:18   #7
Registered User

Join Date: Dec 2008
Location: Melbourne Australia
Boat: Wilf O'Kell 46 Ketch "Meanda"
Posts: 20
Images: 1
IMHO If its a structual fix keep it wet with fresh water ie. dont launch it for a week or more. If its cosmetic I would go at least 24hrs and paint it before it goes back in.
__________________
meanda46 is offline   Reply With Quote
Old 04-10-2009, 05:00   #8
Registered User

Join Date: Sep 2009
Posts: 8
thanks for your help. it was structural and we fixed it two weeks ago and have a sprinkler system on it that wets it for 5 min every hour. would you mind elaborating anyway? i am just really keen to learn as much as i can about ferro boats and would like to know why you think to wait and paint with structural repairs before launching again. thank you very much
__________________

__________________
popeyecrew is offline   Reply With Quote
Reply

Tags
cement hull, ferro

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
Ferro Cement Hulls ? marleman Monohull Sailboats 1045 30-05-2014 04:11
ferro cement ? need advice bigwhyte Monohull Sailboats 52 12-05-2013 19:52
Ferro Cement Hull Sailboats ? Airmeith Monohull Sailboats 37 08-01-2011 05:19
Ferro Cement Hull ID mudnut Monohull Sailboats 3 31-01-2010 11:24
surveying ferro cement boats pman Dollars & Cents 6 25-10-2008 04:15


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:35.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.