Thru Hull bedding compound recommendations - SailNet Community
LinkBack Thread Tools
post #1 of 4 Old 07-30-2010 Thread Starter
Junior Member
Join Date: Jan 2007
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Thru Hull bedding compound recommendations

I am replacing all thru hull fittings in a 45' sailboat I am restoring. It is fiberglass with an airex core. What is the best bedding compund to use to seal up the fittings??
bigwalt is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 4 Old 07-30-2010
Senior Member
Join Date: Jul 2001
Posts: 1,174
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 16
The West Marine web site advisor has a good summary of adhesives, bedding compounds and sealants which should answer all your questions. About the only thing you will get most folks to agree on is to not use 3M 5200
k1vsk is offline  
Quote Quick Reply Share with Facebook
post #3 of 4 Old 07-31-2010
Senior Member
mitiempo's Avatar
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,803
Thanks: 0
Thanked 111 Times in 102 Posts
Rep Power: 10
3M 4200 or Sikaflex 291 are good choices. Also best to remove the Airex around the cutout and replace it with thickened epoxy if this was not done originally as it should have been. This will prevent compression of the hull and eliminate water ingress into the core. While Airex cannot absorb moisture if present it can lead to delamination.

Living aboard in Victoria Harbour
mitiempo is online now  
Quote Quick Reply Share with Facebook
post #4 of 4 Old 08-01-2010
Cal 9.2 SilverSwan
roline's Avatar
Join Date: Jul 2000
Location: East Tennessee
Posts: 272
Thanks: 0
Thanked 2 Times in 1 Post
Rep Power: 17
Always, always, dig the soft coring out around any hole and fill with a thickened epoxy, top side or bottom side:
* To create a solid incompressible wall to prevent the loss of clamp load from the fasteners.
* To seal and protect the core from ingression that can lead to saturation and delamination.
* To unify the structure should you ever decide to replace or re-bed the hardware in the future.
* Reduces the dependency on the sealant selected to the structural soundness of the job.

Cal 9.2 #19 SilverSwan
roline is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome