×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

underwater (salt) powdered glue

underwater (salt) powdered glue

underwater (salt) powdered glue

(OP)
   In my off hours I have a 30,000 lb sailboat down here in Florida.  The transducer now leaks around the caulks. I've tried fine sawdust for the last 6 months trick but its tempory. Is there an underwater powder glue that might suck in from the outside and set up to seal the leak?
Thank you.
        chuck

RE: underwater (salt) powdered glue

Have you tried wood flour instead of sawdust, a little tricky to handle underwater but it works a lot better.

Have you looked at the underwater caulks and epoxies?

RE: underwater (salt) powdered glue

(OP)
   No, unclesyd. I haven't heard of 'wood flour'. sounds like a finer powder than sawdust.  I have to go diving down on the transducer about every 4 months to reapply the sawdust trick. I then squeese two part expoxy putty together and apply a ribbon around the transducer block. still only works for about 4 months then starts to leak again. going down this week to reapply. Is 'wood flour' sold at home depot or ace hardware stores?
     Thank you for the reply
              chuck

RE: underwater (salt) powdered glue

It is a filler and thickener for epoxy systems. You should be able to get it from a marine supply store that carries epoxy or polyester systems.
Is your epoxy system specifically recommended for underwater application?

Look at the underwater caulks.

Does your transducer have treaded section on the part that protrudes through the hull?

Is this a single hull?

I've used several materials, the aforementioned wood flour, beeswax + beef tallow with metallic fillers, and tripled boiled linseed oil + red lead, prior to the advent of underwater systems to stop leaks at thru the hull fittings.  

 

RE: underwater (salt) powdered glue

(OP)
      Is the  'wood flour' from west marine a wood product?
One reason I use sawdust is,  I put it in a sandwich bag,dry then dive below and place the open bag around the transducer. as the sawdust is sucked in, hopefully it embeds and expands as it soaks up water. It works but temporarly. the underwater expoxy putty is put around the outside block but its covered with heavy anti foul paint and does not stick that well.
         Many thanks
               chuck

RE: underwater (salt) powdered glue

Yes it's a product made from wood.

What does the inside of the hull look like where the penetration for the transducer shaft look like?

Is there any room to drive a little waxed packing between the hull and the transducer shaft?

It sounds like this has been going on for awhile, how long before you pull the boat so you can make a proper fix?

The reason I asked about if the inside part of the transducer is threaded and if threaded you could make a large nut and use a soft gasket to seal the inside.
 

RE: underwater (salt) powdered glue

(OP)
    unclesyd
         It'll be another year before I pay to pull the boat out to repaint and fix the transducer. the hull is 3/4" fiberglass and I put the transducer in tight, with
4200 glue all around and tightened down on the transducer nut on the inside. year later it started to leak maybe after some pounding out on the high seas. no room for wax packing at all. maybe that wood flour will swell up inside and stop it a little longer.
         Thank you for the suggestion, I'll go for and let you know.
              chuck

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close