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Old 25 May 2016, 02:34   #1
Country: UK - England
Town: Cheshire
Make: Brig
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Engine: Suzuki 40hp
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Filling Screw Holes on Transom

Any one got any tips how to seal screw holes on the transom of my rib?
I recently bought a new fish finder and had to move the transducer.



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Old 25 May 2016, 03:00   #2
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Country: UK - England
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Dremmel the gel coat back to form a shallow depression, inject west epoxy into the holes, gel coat with parcel tape on top to keep it in place & the air out, sand flat with 800 wet & dry, Polish.

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Old 25 May 2016, 06:08   #3
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As a quick fix, I have put some screws in my old holes, with a bit of marine sealant stuff.

Works for now until the next major maintenance session.

Phil M
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Old 25 May 2016, 07:44   #4
Country: USA
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Feather the holes with a 2" sanding disc until both holes are about 15mm in diameter.

Mix fumed silica and polyester resin until it reaches a consistency between mayonnaise and peanut butter. Use a plastic scraper to pack it in to the hole and build thickness to the feathered area.

Then sand down and gelcoat it.
Gluing geek since 2007
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Old 25 May 2016, 13:17   #5
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Swell seal mastic does what it says
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Old 25 May 2016, 16:42   #6
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plastic padding gelocoat filler works quite well, but only in white. Its not a perfect match but fills very well, cures very quickly and sticks to almost anything. Other solution would be gelcoat mixed with cabosil or fumed silica.

For both. If it is just a screw hole, a countersink drill will provide the required chamfer, then clean with acetone before filling. ECS sell a gelcoat filler too..

If its just gelcoat or gelcoat mixed with silica, it will need something to seal it from air as Pikey suggests. Baking paper works well.

I can make gelcoat stick to epoxy, but it is tricky. Not ideal for a beginner. If boat is painted, just epoxy then paint.

Anyone tried this yet?

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