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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 5200 for motor mount??		  New Topic  Topic Locked
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pfduffy
Captain

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USA
317 Posts
Initially Posted - 03/16/2012 :  05:53:30  Show Profile
Spoke with someone from CD yesterday about a new mount. She suggested 5200 for the mount "because it is below the waterline." I am inclined to use a polysulfide - LifeCaulk (I think.)

Also, I don't ever recall the mount being below the waterline. From where my mount is installed, if it is below the waterline, then I think I've got bigger problems then caulk selection - right?
Pat Duffy
1984 SK/SR #4113
Slàinte
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 03/16/2012 :  06:51:44  Show Profile
LifeCaulk would be a much better choice. Do not use 5200! Be sure to use some sort of backing plate on the inside. I used a piece of 1/4" starboard. To gain a bit more clearance from the rubrail, I also added a piece of 1/2" starboard between the mount and the transom.




Also, another member recommends rounding off the corners of the starboard boards.
Edited by - dmpilc on 03/16/2012 07:00:24
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Prospector
Master Marine Consultant

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Canada
3159 Posts
Response Posted - 03/16/2012 :  06:59:40  Show Profile  Visit Prospector's Homepage
I spoke with a 3M salesperson sometime ago about the difference between 4200 and 5200. I was of the impression (as many others are) that 5200 had better sealing properties that 4200. Apparently I was wrong. According to the salesman, the difference between the two is not in how they seal, but how they harden. 5200 dries harder, making for an installation that is tougher to remove than 4200. Their ability to bond to (interface with) a mating surface is about the same.

I have switched to Boatlife for most of my sealant needs. I find it easier to work with and a better seal. But that is just one guy's impression.
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Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts
Response Posted - 03/16/2012 :  08:42:42  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by pfduffy</i>
<br />...if it is below the waterline, then I think I've got bigger problems then caulk selection - right?<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">That's for sure! And so would your motor!

If you use 5200 and then one day decide to replace the bracket (or a future owner does), you're likely to pull off some gelcoat in the process. (...speaking from experience!) BoatLife <i>Life Caulk</i> seals just fine, even below the waterline, and hardware bedded with it can be removed without drama. (<i>Life Seal</i> is better for plastic hardware.)
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 03/16/2012 :  10:34:50  Show Profile  Visit delliottg's Homepage
Concur, I no longer use 5200 anywhere on my boat. As Dave suggested Life Caulk or Seal are better choices. I used Life Caulk when I mounted my Garelick for our new Tohatsu 9.8 a few years back. Instead of Starboard for backing, I used two 1/4" x 2" x 14" or so aluminum plates. I think Starboard would be a fine substitute. I also used a piece of UHMW plastic (otherwise known as a cutting board) as a backer to the bracket, I wasn't looking for stand off room, just to spread the load a bit more.

If you're interested, here's the link to [url="http://www.catalina-capri-25s.org/forum/topic.asp?TOPIC_ID=17458&SearchTerms=mount,tohatsu"]how I did it[/url]. This is on a C-250, not a C-25, but a lot of it should cross over.
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hewebb
Admiral

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USA
761 Posts
Response Posted - 03/17/2012 :  05:26:46  Show Profile
I used 5200 to install a thru hull fitting. I took the plug from drilling the hole and two old pieces of wood and used the 5200 to glue them together. I did not clean any of the pieces. So far I have not been able to break them apart. They will sit in water for several weeks/months and I will keep trying. I think using 5200 will make a permanent joint and lots of damage will result if you try to remove the parts. I found some caulk that appears to be rubber like that is advertised to be permanent, even under water, that I have used and have started a test to see if it stays pliable. It is white and messy to use.
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redviking
Master Marine Consultant

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USA
1771 Posts
Response Posted - 03/17/2012 :  09:43:31  Show Profile
I respectfully disagree. 5200 is a fine product for this application... The motor mount is unlikely to be replaced if the mount is made right... Why sailors have a bias regarding 5200 is beyond me. I use it all the time for applications that should stay put long after I am dead...

Sten
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 03/17/2012 :  10:40:32  Show Profile
Well, the motor mount that came with my C-25 was right, 28 years ago if the motor was a 7.5 hp 2 stroke. It was not suitable for a more modern 9.9 2-stroke or the 4-stroke Nissan 9.8 XL shaft that I bought. so, I replaced it. I shudder to think of the extra work and aggrivation I would have gone through if the PO had used 5200!
Edited by - dmpilc on 03/17/2012 10:44:14
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.