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post #1 of 18 Old 04-12-2008 Thread Starter
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Thru Hull Sealant

I am in the process of changing the thru hull transducer for my depth sounder. It is a HawkEye with the plastic transducer.
Any suggestions on what sealant to use. I have had the suggestion of 3M 5200, would seem a bit hard to get apart if there ever was a problem.
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post #2 of 18 Old 04-12-2008
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I'd use

Sikaflex 291 or 3M 4200... Be very careful using a polysulfide on certain plastics such as 3M 101 or Life Caulk as they may not be compatible..

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Last edited by Maine Sail; 11-10-2008 at 10:04 PM.
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post #3 of 18 Old 04-12-2008
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I would 2nd the use of sikaflex 291. Used the stuff on my plastic transducer last year & last time I checked the boat was still afloat
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post #4 of 18 Old 04-12-2008
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I used 4200 on mine and no problems after many years. I once had to take something apart that was joined with 5200; no fun.
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post #5 of 18 Old 04-12-2008
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I would second the use of 4200, worked well for me. While you have the tranduscer out it is a good time to make sure the hull is sealed up. If you have coring in that location then it might be worth while to clean it up and apply a good water tight epoxy coating.

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post #6 of 18 Old 04-12-2008
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Sikaflex 291 is good - it presumably has higher flexibility than 4200 and can be taken apart eventually.
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post #7 of 18 Old 04-12-2008
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do you apply the sealant only on the exterior or should you also apply a bead to the locking ring?

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post #8 of 18 Old 04-12-2008
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I put it everywhere. The way I figure - the sealant that's inside the hull opening around the thruhull body is what does most of the work.

I have my own process for replacing thru hulls - I clean the area and the opening, sand them down to gelcoat/clean glass/etc, then cover with a thin layer of clear epoxy as a kind of a barrier coat. Then sand the epoxy layer to create a tooth and then install the thruhull with sealant. I don't know if this actually does anything, but it makes me feel all warm and fuzzy.

Last edited by brak; 04-12-2008 at 08:53 PM.
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post #9 of 18 Old 04-12-2008 Thread Starter
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Thanks for the advise.
The hole was 2 1/8 dia. and needed to be 2" dia. so I filled with 3M Blister and repair filler, then redrilled to 2". It is a short strand fiberglass filler so it is supposed to be waterproof.
I will use the 4200.
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post #10 of 18 Old 04-14-2008
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I hope you also put at least a couple layers of fiberglass over the area on both the interior and exterior--grinding a taper and glassing it properly. IMHO, using just 3M blister and repair filler by itself I don't think is a sufficient way to repair the area.

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