Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 29-06-2022, 11:56   #1
Registered User

Join Date: Nov 2017
Location: Denmark
Boat: Grace 30
Posts: 28
Fibreglass thought? foredeck core replacement

Hi all!
after founding out that a large part of the balsa core in the foredeck is rotten, its time to replace it. To that i need to use some fibreglass to close up the deck again, after the new core has been placed.

so far i have three candidates of fibreglass to use, fyi following numbers are measured in [g/m^2] and i'm gonna use Epoxy for the fibreglass

-900 Biaxial combi with a layer of csm
-Either a 800 or 1200 Triaxial woven mat
-800 Quadriaxial woven mat

which would you go for?

looking forward to hear your thought!
-MV
modernviking is offline   Reply With Quote
Old 29-06-2022, 12:36   #2
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,471
Re: Fibreglass thought? foredeck core replacement

I love baltech so Iíd replace balsa with balsa. Quadaxiel is overkill. More for thinner hull sides or building up transom and chines.
800 gets really good saturation 1200 you need to vacuum bag or get real lucky.
Iíve done a patch in port side about a foot behind the bow. The boat sank but no water got in the balsa deck and the hull is solid.
I started my patch with very fine glass on 3 layers. Then heavy weights. Iíve even used .30 and .50 cloth to do minor repairs
The bow has no interior but even the interior looks factory gel coat. The boat skipped along a rock at a pretty good speed. Itís a Donzi 18. The hit tore the lower end of the drive off. Insurance wrote it off and I dove on it to bring it up. Took two inflation bags we nicknamed the Chrysler bag cause one will pick up a 70í Chrysler wagon.
The bow damage was bad but there were 4 other damaged areas one on the chine I used .50 cloth to fill 1/8Ē damage.
Iíd even suggest using a layer of Matt as a filler on a deck between cloth.
Rumrace is online now   Reply With Quote
Old 29-06-2022, 12:45   #3
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,471
Re: Fibreglass thought? foredeck core replacement

Matt flexes less than cloths. Down side is itís prone to voids
Boat makers that ran a few interior trusses seem to have dodged failing decks.
Some of the most expensive famous brands have a separation problems there and hull chines. Not the chopper gun boats either. Hand laid QC slips. 30 years later delaminating
Rumrace is online now   Reply With Quote
Old 29-06-2022, 13:13   #4
Marine Service Provider

Join Date: Dec 2010
Location: Little Compton, RI
Boat: Cape George 31
Posts: 2,317
Re: Fibreglass thought? foredeck core replacement

900 biaxial. That will be hard enough to wet out thoroughly with epoxy.
The others will be harder to get wet.
Don't use balsa.
__________________
Ben
zartmancruising.com
Benz is offline   Reply With Quote
Old 29-06-2022, 15:31   #5
Registered User

Join Date: Mar 2015
Location: Boston's North Shore
Boat: Pearson 10M
Posts: 837
Re: Fibreglass thought? foredeck core replacement

Biaxial and Divinycell.
guyrj33 is offline   Reply With Quote
Old 29-06-2022, 15:33   #6
Registered User

Join Date: Jan 2018
Boat: 50ft Custom Fast Catamaran
Posts: 6,740
Re: Fibreglass thought? foredeck core replacement

I would use the biax and foam also. Not a fan of mat with epoxy work. Just adds extra weight with little added strength
__________________
Epoxy can kill me like a kid smelling peanuts across the lunch room. Even the freshly machined dust from cured epoxy. Please donít suggest using it.
Chotu is online now   Reply With Quote
Old 29-06-2022, 17:12   #7
Marine Service Provider
 
boatpoker's Avatar

Join Date: Nov 2008
Location: Port Credit, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
Posts: 5,720
Re: Fibreglass thought? foredeck core replacement

Quote:
Originally Posted by Chotu View Post
I would use the biax and foam also. Not a fan of mat with epoxy work. Just adds extra weight with little added strength
Epoxy does not bond well with mat as it does not dissolve the binder holding the mat together (polyester does).
__________________
Your doubt does not negate my experience.
boatpoker is offline   Reply With Quote
Old 29-06-2022, 17:35   #8
Registered User

Join Date: Jan 2018
Boat: 50ft Custom Fast Catamaran
Posts: 6,740
Re: Fibreglass thought? foredeck core replacement

Quote:
Originally Posted by boatpoker View Post
Epoxy does not bond well with mat as it does not dissolve the binder holding the mat together (polyester does).
Exactly. That’s the other reason. It simply becomes added weight. It’s not really doing much.
__________________
Epoxy can kill me like a kid smelling peanuts across the lunch room. Even the freshly machined dust from cured epoxy. Please donít suggest using it.
Chotu is online now   Reply With Quote
Old 29-06-2022, 17:42   #9
Marine Service Provider
 
boatpoker's Avatar

Join Date: Nov 2008
Location: Port Credit, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
Posts: 5,720
Re: Fibreglass thought? foredeck core replacement

I have a few thoughts on balsa core
Balsa Core = Compost on our website.
__________________
Your doubt does not negate my experience.
boatpoker is offline   Reply With Quote
Old 29-06-2022, 19:39   #10
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,471
Re: Fibreglass thought? foredeck core replacement

Every boat builder is using end grain balsa on deck and couch roof. I know a few were using foam again. Should be fun. Plywood never connected.
I have an inner and outer mould layer Kevlar roving Vinylester gel coats balsa core.
Replace it like the manufacture. Trust them not us
Rumrace is online now   Reply With Quote
Old 29-06-2022, 19:55   #11
Registered User

Join Date: Mar 2011
Location: Southport CT
Boat: Sabre 402
Posts: 2,233
Re: Fibreglass thought? foredeck core replacement

Is there a reason you are not considering attacking this problem from underneath? That would leave the outer deck layer intact, with no need to replicate nonskid areas or re-gelcoat the top surface, or paint it.
psk125 is offline   Reply With Quote
Old 29-06-2022, 20:09   #12
Registered User
 
Boatyarddog's Avatar

Join Date: Nov 2014
Location: Olympia, Washington
Boat: 1979 Mariner Ketch 32-Hull 202
Posts: 2,089
Images: 2
Re: Fibreglass thought? foredeck core replacement

Quote:
Originally Posted by psk125 View Post
Is there a reason you are not considering attacking this problem from underneath? That would leave the outer deck layer intact, with no need to replicate nonskid areas or re-gelcoat the top surface, or paint it.
Good Question.
Maybe tight quarters.
Boatyarddog
Boatyarddog is offline   Reply With Quote
Old 30-06-2022, 05:42   #13
Registered User

Join Date: Jun 2019
Location: Rochester, NY
Boat: Chris Craft 381 Catalina
Posts: 3,712
Re: Fibreglass thought? foredeck core replacement

Quote:
Originally Posted by psk125 View Post
Is there a reason you are not considering attacking this problem from underneath? That would leave the outer deck layer intact, with no need to replicate nonskid areas or re-gelcoat the top surface, or paint it.

That works if there's enough room to do it from underneath, but sometimes interior disassembly plus working against gravity is worse than having to put the cosmetic parts back together.
rslifkin is offline   Reply With Quote
Old 30-06-2022, 06:18   #14
Registered User

Join Date: Jan 2016
Location: Portsmouth, UK
Boat: Westerly Conway 36ft
Posts: 960
Re: Fibreglass thought? foredeck core replacement

Quote:
Originally Posted by boatpoker View Post
Epoxy does not bond well with mat as it does not dissolve the binder holding the mat together (polyester does).
I understand you can get CSM with an epoxy soluble binder now? As you say. standard csm should not be used with epoxy for the reason stated.
Clivevon is offline   Reply With Quote
Old 30-06-2022, 06:49   #15
Registered User

Join Date: Jan 2018
Boat: 50ft Custom Fast Catamaran
Posts: 6,740
Re: Fibreglass thought? foredeck core replacement

Quote:
Originally Posted by Clivevon View Post
I understand you can get CSM with an epoxy soluble binder now? As you say. standard csm should not be used with epoxy for the reason stated.
Even if you can, itís a bad idea. It creates a lesser quality laminate with more weight.

Poor idea in general.
__________________
Epoxy can kill me like a kid smelling peanuts across the lunch room. Even the freshly machined dust from cured epoxy. Please donít suggest using it.
Chotu is online now   Reply With Quote
Reply

Tags
core, deck, men

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Foredeck re-core. Kelkara Construction, Maintenance & Refit 13 29-05-2022 04:08
To core or not to core? SwampSailor Construction, Maintenance & Refit 22 13-06-2019 15:01
New Core for Foredeck Captndan714 Construction, Maintenance & Refit 33 12-04-2013 15:53
To balsa core or not to balsa core? fbchristo Multihull Sailboats 135 04-02-2009 15:13

Advertise Here


All times are GMT -7. The time now is 04:06.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.