SILICONE to mount in-hull transducer? - Page 3 - SailNet Community
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post #21 of 36 Old 12-18-2013
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Re: SILICONE to mount in-hull transducer?

In order to find a good spot on my C22, I stuck the transducer in a wad of toilet bowl mounting wax. I ended up leaving it there for 4 years, no problem. May not work so well in warmer areas of the country. My boat now has the transducer mounted in a pool of epoxy. However, there was some releasing agent between the epoxy and the hull (wax?), so it can be removed without any technical tapping. I would be a little worried about putting it in too big of a pool of epoxy. The epoxy get pretty hot while curing.

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post #22 of 36 Old 12-18-2013
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Re: SILICONE to mount in-hull transducer?

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In order to find a good spot on my C22, I stuck the transducer in a wad of toilet bowl mounting wax. I ended up leaving it there for 4 years, no problem. May not work so well in warmer areas of the country. My boat now has the transducer mounted in a pool of epoxy. However, there was some releasing agent between the epoxy and the hull (wax?), so it can be removed without any technical tapping. I would be a little worried about putting it in too big of a pool of epoxy. The epoxy get pretty hot while curing.
I avoid waxes as they can affect the epoxy (or silicone) sticking. I use a baggie of water and move it around until I get good results, best place being forward of the keel, usually under the aft end of the V-berth. A no mess solution. If the hull is V'ed and needs thicker epoxy I do it in stages to avoid heat.

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post #23 of 36 Old 12-18-2013
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Re: SILICONE to mount in-hull transducer?

The West System method seems very slick. Wish I would have gone that route. I keep a can of Acetone and sandpaper onboard to clean surfaces before mounting anything.

All in all I'm thankful the P79 exists. I didn't have to drill into the hull and the transducer works great in my application mounted forward of the keel. I did have to buy an extension cable. I didn't actually get it working until the last week of the season. It was fun seeing all of the fish in the Chesapeake and the C&D Canal in early November, a few of them big. I also installed two rod holders for next season.
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post #24 of 36 Old 12-18-2013
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Re: SILICONE to mount in-hull transducer?

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......best place being forward of the keel, usually under the aft end of the V-berth. A no mess solution. If the hull is V'ed and needs thicker epoxy I do it in stages to avoid heat.
Do you build any kind of a "wall" around the transducer to protect it from something banging into it? If so, how do you do it?

Could you cut a piece of PVC pipe conforming to the hull angle and a bit larger and a bit taller than the transducer, glue it using silicone then once set, pour the epoxy and stick the transducer inside, would that work?
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post #25 of 36 Old 12-18-2013
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Re: SILICONE to mount in-hull transducer?

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Do you build any kind of a "wall" around the transducer to protect it from something banging into it? If so, how do you do it?

Could you cut a piece of PVC pipe conforming to the hull angle and a bit larger and a bit taller than the transducer, glue it using silicone then once set, pour the epoxy and stick the transducer inside, would that work?
Mine is not in a place of concern under the forward cabin floor but I suppose you could put something around it. How about a PVC water closet(toilet) flange?
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post #26 of 36 Old 12-18-2013
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Re: SILICONE to mount in-hull transducer?

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Originally Posted by SVTatia View Post
Do you build any kind of a "wall" around the transducer to protect it from something banging into it? If so, how do you do it?

Could you cut a piece of PVC pipe conforming to the hull angle and a bit larger and a bit taller than the transducer, glue it using silicone then once set, pour the epoxy and stick the transducer inside, would that work?
Every boat and location is different. All you want is something to protect it from items stored in the locker. Whatever works in your location, but doesn't have to be a tube, just an effective guard of some sort if the transducer is exposed.

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post #27 of 36 Old 12-18-2013
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Re: SILICONE to mount in-hull transducer?

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Greg, that's essentially how my transducer (Airmar P79) mounts. It comes with a plastic cylinder "base", which is cut at an angle and flanged on one end. This end is placed on the hull, rotated until the top end is perfectly level, and siliconed down. After curing, it gets filled with propylene glycol and the 'ducer gets sealed inside.

I'm still surprised at the use of clear silicone, but if it worked for you, I'm sure it'll work for me! And I might very well have to move the 'ducer, since I was unable to test it with the boat in the water prior to mounting. I have it placed in the area recommended by Airmar, and where other owners of Catalina 22's have mounted theirs, so I hope my odds of success are at least pretty fair.

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.
My transducer installation was similar. The base provided is genius because it allows installation on an angle with no home engineering. I was able to mount mine on the centerline with a zero angle.

I cleaned the fiberglass at the mounting location with 60 grit wet/dry sandpaper then acetone. Then I mounted the base with Boatlife caulk. I filled the base with mineral oil (freezing point -22F). If my bilge is colder than that I got bigger problems than freezing and cracking the base of my depth sounder installation.

I am very happy with the result. Been in service a couple of years.

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post #28 of 36 Old 12-19-2013
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Re: SILICONE to mount in-hull transducer?

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Originally Posted by mitiempo View Post
I use a baggie of water and move it around until I get good results, best place being forward of the keel, usually under the aft end of the V-berth. A no mess solution. If the hull is V'ed and needs thicker epoxy I do it in stages to avoid heat.
I have a transducer there for depth and one apposing that one for a paddle-wheel for speed? all older st50 stuff. Wander if it will adversely effect its reading if I put in in the same vicinity?
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post #29 of 36 Old 12-20-2013
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Re: SILICONE to mount in-hull transducer?

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Originally Posted by jrd22 View Post
I've mounted several in hull transducers using silicone and it works great. I used a zip lock bag with mineral oil in it to locate a good location on the hull, then apply a large blob (technical term) of clear silicone. Hold the tip of the tube in the center of the location you've chosen and just squeeze it out around the tip, that results in the fewest bubbles forming. Just let the ducer settle down into it (angle it a bit at first to let air escape) and secure it with duct tape or something if it tends to move downhill on you.
How do you know when you have found a good location?
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post #30 of 36 Old 12-20-2013
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Re: SILICONE to mount in-hull transducer?

There is a product called Duct Seal Compound. It costs less than $5 at the big box hardware stores. I going to try it. Have any of you tried it?
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