SILICONE to mount in-hull transducer? - Page 2 - SailNet Community
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post #11 of Old 12-15-2013
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Re: SILICONE to mount in-hull transducer?

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Originally Posted by dixiedawg View Post

I'm not sure why Airmar recommends the propylene glycol.....
So it doesn't freeze and crack the tube or damage the transducer.

This was more common in the past than now. I have had several boats with the transducer in fluid filled tubes. On my current boat it was done this way and the fluid had all leaked out. It was aft, wrong place anyway.

Most depth sounder manufacturers recommend epoxy now as I posted, a few silicone, but rarely do they recommend the fluid filled tube - just attaching the transducer directly to the inside of the hull is the easiest and most maintenance free way.

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Re: SILICONE to mount in-hull transducer?

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So it doesn't freeze and crack the tube or damage the transducer.
Ah, yes, of course. Too many years in Florida makes you forget such things.
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post #13 of Old 12-15-2013
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Re: SILICONE to mount in-hull transducer?

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Originally Posted by dixiedawg View Post
I'm not sure why Airmar recommends the propylene glycol, either, but I'll just roll with it. After some research, I've found Prestone "Lo-Tox" antifreeze uses propylene glycol in a concentration of 90-100%, according to their MSDS's. So, it's off to the auto parts store in the AM.
Good luck and hope it works first time for you!

I used mineral oil and it's been working for many years. BUT, we are in warm to tropical waters ALL of the time....

Most likely they recommend the poly-gly in case the craft is in a cold climate. If I was in an area where it drops below freezing, I would most likely go that way.

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post #14 of Old 12-15-2013
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SILICONE to mount in-hull transducer?

If I remember the recommendations for my P79
indicated that epoxy will become brittle over time, which would lead to leaking. I used 3M 4200 as it was what I had handy. I've since heard that some adhesives may attack the plastic, not sure if 4200 will. Silicone is probably a safer bet.

The Propylene Glycol of course makes sense for reasons of freezing. I took a chance and mounted it permanently without testing function and it works great. I do know that it will not work without being filled with liquid. I also applied a food grade lubricant to the threads as I do with my strainer basket lids.
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post #15 of Old 12-16-2013
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Re: SILICONE to mount in-hull transducer?

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Originally Posted by Missingyou View Post
If I remember the recommendations for my P79
indicated that epoxy will become brittle over time, which would lead to leaking.
Polyester gets brittle - epoxy shouldn't.

The transducers are potted in epoxy - nothing will have an effect on it.

That is the beauty of attaching the transducer to the hull with whatever you choose instead of a liquid filled tube - nothing to leak.

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post #16 of Old 12-17-2013
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Re: SILICONE to mount in-hull transducer?

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Originally Posted by mitiempo View Post
Polyester gets brittle - epoxy shouldn't.

The transducers are potted in epoxy - nothing will have an effect on it.

That is the beauty of attaching the transducer to the hull with whatever you choose instead of a liquid filled tube - nothing to leak.
The instructions state that epoxy is too brittle. Here are the Warnings within the Installation Instructions.

WARNING
: Always wear safety goggles and a dust
mask to avoid personal injury.
CAUTION
: The fiberglass hull below the transducer
must be solid. The transducer
will not transmit through
coring material such as foam or balsa wood.
CAUTION
: Do not use an epoxy adhesive because it
is too brittle.
CAUTION
: Never pull, carry, or hold the transducer by
the cable. This may sever internal connections.
CAUTION
: Never use solvents. Cleaners, fuel,
sealants, paint, and other
products may contain strong
solvents, such as acetone, which attack many
plastics, greatly reducing their strength.
IMPORTANT
: Please read the inst
ructions completely
before proceeding with the installation. These
instructions supersede any ot
her instructions in your
instrument manual if they differ

Last edited by Missingyou; 12-17-2013 at 02:09 PM. Reason: typo
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post #17 of Old 12-17-2013
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Re: SILICONE to mount in-hull transducer?

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There are few things on a boat that a good whack with a hammer won't set right.
In the computer maintenance field we refer to this as percussive maintenance, and if you want to sound more professional than "give it a thump" we say "it needs a technical tap."
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Re: SILICONE to mount in-hull transducer?

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The instructions state that epoxy is too brittle. Here are the Warnings within the Installation Instructions.
Epoxy is no more brittle than the polyester you are attaching it to. Having used epoxy for over 25 years (West System as well as other brands) I have never found it brittle. As I posted the transducer face can be epoxied to the hull without the tube and fluid. It has worked fine for my customers as well as on my own boats in every instance - for Airmar as well as other brands of transducers.

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post #19 of Old 12-18-2013 Thread Starter
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Re: SILICONE to mount in-hull transducer?

Brian, I was intrigued by the West System method in the link you posted, is that the way you get the unit perfectly level, without the use of an angled base of some kind?

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Re: SILICONE to mount in-hull transducer?

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Originally Posted by dixiedawg View Post
Brian, I was intrigued by the West System method in the link you posted, is that the way you get the unit perfectly level, without the use of an angled base of some kind?

Yes

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