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Author Topic:   Best silicone for transducer screws etc
JCL posted 09-29-2002 06:45 PM ET (US)   Profile for JCL   Send Email to JCL  
What is the best silicone for underwater areas like sonar transducers mtg. screws and engine mounting bolts etc. Is there such a thing as lifetime sealer and is it removable?
Any suggestions will be appreciated.
jimh posted 09-29-2002 07:14 PM ET (US)     Profile for jimh  Send Email to jimh     
I believe the Whaler factory uses Bostik 902. This may be hard to obtain in small tubes.
Dick posted 09-29-2002 08:42 PM ET (US)     Profile for Dick  Send Email to Dick     
I like Life Calk made by Boat Life. Their number 1030, it stays flexible and is removable.
jameso posted 09-30-2002 09:08 AM ET (US)     Profile for jameso  Send Email to jameso     
3M 5200, best I have found, use above or below water. Some silicones will not adhere well, I have replaced some RTV type silicone caulk that you can roll of with your fingers.
my 02, Jim Armstrong
kingfish posted 09-30-2002 11:34 AM ET (US)     Profile for kingfish  Send Email to kingfish     
I'm with jameso, with the caveat that if you want to have the additional advantage of being able to remove it, I'd use 4200 and I'd use fast-cure whichever one you use. With the application you're anticipating, I don't think removal would be an issue, as it would not leave you unable to remove screws. Where 5200 is permanent and 4200 is not is when the usage is as an adhesive rather than a sealer in screw holes. So I guess I'm back to supporting jameso without a caveat.

I've never tried Life Caulk, but I have heard a number of positive things about it too, and Dick knows what he is talking about.


where2 posted 10-02-2002 12:52 PM ET (US)     Profile for where2  Send Email to where2     
To create a lifetime transducer mount, screw a block of 3/4" Starboard to your transom and seal the screws and mounting holes to the transom with 5200. (Do not adhere the block to the transom with 5200, just seal the screws and their holes.) Then mount the transducer to the Starboard block using 3/4" screws. When it comes time to update with a newer transducer, you never have to remove the block, just drill new holes and mount your new transducer. If the transducer strikes an object, you don't have to worry so much about water intrusion because the screws are likely to pull out of the Starboard before the screws and 5200 let go of the transom.

The fewer holes you have to drill below the water line, the less you have to worry about in the long run.

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