Reply
 
Thread Tools Search this Thread
 
Old 29 January 2019, 06:50   #1
Member
 
Country: USA
Town: Blackshear
Boat name: Astro
Make: Astro Boats
Length: 5m +
Engine: 70 hp outboard
Join Date: Jan 2019
Posts: 4
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?
__________________

__________________
Graycoyote77 is offline   Reply With Quote
Old 29 January 2019, 12:41   #2
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,230
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.
__________________

__________________
Richard
Gluing geek since 2007
Opinions and intepretations expressed are solely my own and do not express the views or opinions of my employer
office888 is offline   Reply With Quote
Old 29 January 2019, 12:43   #3
Member
 
Country: Other
Town: Varna
Make: Adventure
Length: 5m +
Engine: Honda EF 50
Join Date: Jan 2018
Posts: 8
I use this MS POLYMER - Sea-Line® - yacht paints and fillers
but don't know if you have in usa.
Some Sika?
__________________
kalin is offline   Reply With Quote
Old 29 January 2019, 22:07   #4
Member
 
Country: USA
Town: Blackshear
Boat name: Astro
Make: Astro Boats
Length: 5m +
Engine: 70 hp outboard
Join Date: Jan 2019
Posts: 4
Thanks, gave me some ideas. Never thought about water following the bolt thread, to rot the transom.
__________________
Graycoyote77 is offline   Reply With Quote
Old 30 January 2019, 15:48   #5
Member
 
Country: UK - Wales
Town: Cardiff
Length: no boat
Join Date: Aug 2014
Posts: 1,131
CT1 but don’t think you get it there.... 3M 4200 but not quick cure is supposed to be very good...
__________________
HDAV is offline   Reply With Quote
Old 08 February 2019, 09:04   #6
Member
 
Country: UK - England
Town: Bournemouth
Make: Avon
Length: 3m +
Engine: Merc 25hp 2stroke
Join Date: Nov 2014
Posts: 107
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.
__________________
mattwarner is offline   Reply With Quote
Old 08 February 2019, 11:09   #7
Member
 
Country: Other
Make: Avon Searider
Length: 4m +
Engine: Yamaha 50
Join Date: Jan 2004
Posts: 5,469
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.
__________________
Tim M is offline   Reply With Quote
Old 10 February 2019, 05:43   #8
Member
 
Country: USA
Length: under 3m
Join Date: Aug 2007
Posts: 22
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.
__________________

__________________
seahorse is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 05:15.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.