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Old 29 January 2019, 11:50   #1
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Best Marine Caulk

Had to remove my 1989 70 hp Mercury from the aluminum boat in order to change the tilt / trim motor. The factory used an adhesive marine caulk around the mounts for the outboard, I guess for looks and vibration. What is the best marine adhesive caulk to go back with?
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Old 29 January 2019, 17:41   #2
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Toothpaste tube of 3M 4200.

Use a polyurethane based marine caulking on both ends of the bolts. It keeps the moisture from rotting the transom core.
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Old 29 January 2019, 17:43   #3
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I use this MS POLYMER - Sea-Line® - yacht paints and fillers
but don't know if you have in usa.
Some Sika?
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Old 30 January 2019, 03:07   #4
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Thanks, gave me some ideas. Never thought about water following the bolt thread, to rot the transom.
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Old 30 January 2019, 20:48   #5
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CT1 but don’t think you get it there.... 3M 4200 but not quick cure is supposed to be very good...
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Old 08 February 2019, 14:04   #6
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4200 is the stuff everyone recommends, I have always used Sikaflex 291i? but personally hate the stuff and have never found a way to reseal it after use and so end up a one shot item which I end up stabbing holes in to get to the uncured gloop. I have also found it had little flex to it and falls out of any fittings with any movement after time.
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Old 08 February 2019, 16:09   #7
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As per the above: Sikaflex 291 or 3m 4200 or 5200. The main reason is to stop water ingress into the transom rather than for vibration reduction. You can buy mini tubes as well as the big ones that go in a caulking gun. One small tube would probably be enough for four bolts. If you buy a big one store it in the freezer after use - next time you need it just defrost for half an hour in warm water - you can do that as many times as you need. If you don't the nozzle end will go off and you wont be able to use it.
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Old 10 February 2019, 10:43   #8
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BoatLife LifeCalk or LifeSeal work very well, rated for underwater usage, and do not "glue" the motor to the transom as 3M 5200 polyurethane does.

Evinrude installation manuals state not to use a polyurethane adhesive (5200) to mount the engines.
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