Spray Foam? - SailNet Community
  • 1 Post By paul323
LinkBack Thread Tools
post #1 of 3 Old 04-01-2012 Thread Starter
Join Date: Feb 2012
Location: Charlotte NC
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Spray Foam?

Can products like "great stuff" be used as a replacement for foam that had to be cut out of a small sailboat. It will be (epoxy) glassed over and is replacing what seems to be the support structure running from bow to stern (most of the way). The foam that came out was beyond repair (water saturated) and didnt really seem all that stiff, more of just a shape holding support. Thanks.
jcase12 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 3 Old 04-01-2012
Join Date: Mar 2010
Location: SF - South Bay
Posts: 583
Thanks: 1
Thanked 21 Times in 21 Posts
Rep Power: 6
Re: Spray Foam?

I have used it, with limiited success. My issue with it is uneven expansion (as it tends to come out of a nozzle, the foam expands in a spherical way - not good for small corners) and limited quantities (if I need to use 2+ cans, with the uneven expansion I get some voids). In the right place - small, regular voids, especially with limited access - it can work.

I moved exclusively to using the 2-part pourable expanding foam, which works really well, filling every crevice. It is also highly adhesive and will provide good structural support in the kind of application you are discussing, and easy to shape and glass. It is also fun to use and fascinating to watch expand! However, you need to be very careful with this stuff too; the expanding foam exerts considerable force, so make sure there is large vent hole. I have seen it tear open fiberglass flotation chambers, bow out hull sides....
jcase12 likes this.
paul323 is offline  
Quote Quick Reply Share with Facebook
post #3 of 3 Old 04-02-2012
Senior Member
Join Date: Jan 2012
Location: British Columbia
Posts: 2,833
Thanks: 20
Thanked 41 Times in 39 Posts
Rep Power: 4
Re: Spray Foam?

Works for filling voids on steel boats , but useless for aluminium as water condenses under it , and it gets soggy. No substitute for epoxy on the inside of a steel boat. Quite porous.

Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"
Brent Swain 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Insulate Icebox Using Foam Spray Neicy Gear & Maintenance 4 05-01-2011 10:27 AM
Sea Spray 15' Cat Marigaux Boat Review and Purchase Forum 9 04-09-2009 02:42 AM
Using spray foam to seal a leak Survivor Gear & Maintenance 10 11-10-2008 02:47 PM
spray foam + inflatable boat = save it or kill it? piggybeach Gear & Maintenance 22 07-16-2007 05:43 PM
Spray Protector tm3 Gear & Maintenance 1 09-25-2004 01:41 PM

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