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Wigeon
Joined: 29 Apr 2013 Posts: 41 City/Region: Bellingham
State or Province: WA
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Posted: Mon Feb 23, 2015 11:18 pm Post subject: Bedding compound |
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Im doing some bedding and re-bedding. Sikaflex 291 has been recommended and I think I'll give it a try. I thought about 3M 4200, but it's listed as an adhesive and since I'm using fasteners (nuts and bolts) I don't need the the adhesive characteristic. Any thoughts or experiences with Sikaflex 291 or perhaps another product you've found that might work better? My project area will certainly get wet, but will not be submerged. Many thanks in advance. Larry |
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journey on
Joined: 03 Mar 2005 Posts: 3595 City/Region: Valley Centre
State or Province: CA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: journey on
Photos: Journey On
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Posted: Mon Feb 23, 2015 11:30 pm Post subject: |
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I use 3M sealants, though I've tried others. 3-M seems to work best for me. Just my experience.
I use 5200 when I want to really, really attach something. I also use it when I'm installing a screw in the hull, to give a permanent seal and prevent leakage into the core. It's really cheap at Home Depot.
I used to use 4200 when I wanted to seal something, but it always turns brown when it's out in the sun. And I have a vague memory that some of the Sikaflex line also turns color. So now I use 4000. It stays white, sticks well and is flexible. It's more of a sealant then adhesive.
All of the above can be used above or below the waterline. And Marine Debond removes them all, with a little work.
Boris |
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BRAZO
Joined: 29 Jul 2008 Posts: 650 City/Region: Full-time Travel
State or Province: NV
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: Meyer Meyer
Photos: BRAZO
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rogerbum
Joined: 21 Nov 2004 Posts: 5922 City/Region: Kenmore
State or Province: WA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Vessel Name: Meant to be
Photos: SeaDNA
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Posted: Tue Feb 24, 2015 10:45 am Post subject: |
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Butyl tape or silkaflex are both better bedding options than 3M 4200 or 5200. I'd use butyl tape if I were you. Easier to install and clean up after than the other options. _________________ Roger on Meant to be |
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Jazzmanic
Joined: 07 Feb 2005 Posts: 2231 City/Region: Seattle
State or Province: WA
Photos: C-Dancer
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Posted: Tue Feb 24, 2015 12:56 pm Post subject: |
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I used Sikaflex 291 as the bedding compound for our stainless steel radar arch. It replaced the 4200 that I originally used and leaked. However, the leaking was caused more by the inadequate amount of 4200 used. In any case, no leaks with Sikaflex after 8 years. _________________ Peter & Caryn
C-Dancer - 2005 22' Cruiser 2005-2017
Island Time - 2018 Ranger Tug 23 2017-2022
Email: pjamero@gmail.com |
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hardee
Joined: 30 Oct 2006 Posts: 12632 City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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Posted: Tue Feb 24, 2015 1:17 pm Post subject: |
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Doesn't the butyl tape leave black streaking over time?
Harvey
SleepyC
_________________ Though in our sleep we are not conscious of our activity or surroundings, we should not, in our wakefulness, be unconscious of our sleep. |
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srbaum
Joined: 30 Aug 2010 Posts: 875 City/Region: Portsmouth
State or Province: VA
C-Dory Year: 2007
C-Dory Model: 26 Venture
Vessel Name: Osprey
Photos: Osprey
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Posted: Tue Feb 24, 2015 4:40 pm Post subject: |
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Use white butyl tape and you will be happy with the results. I have a roll of the tape in a Ziploc bag. It works in your hands like plumbers putty and there is no waste. Also the stuff never hardens, unlike typical bedding compounds. I purchased my roll of butyl tape from sailrite.com and have enough to share with all of my local boating buddy's. _________________ Steve Baum
Homeport of Portsmouth, VA
OSPREY (Ex Mister Sea) 2000 22 C-Dory 2010 - Sold 3/19
OSPREY (Ex ADITI) 2007 26 Cape Cruiser 2018 |
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thataway
Joined: 02 Nov 2003 Posts: 20803 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Tue Feb 24, 2015 8:54 pm Post subject: |
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3M 4000 is close to the 4200 in bonding and does not yellow as the 4200 and 5200 compounds do.
I want the best adhesion possible with any "bedding" compound. Remember to seal the core, with epoxy, even if you don't have leaks, wet core or rot currently. This is key to maintaining a boat which has any wood cored structure. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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Wigeon
Joined: 29 Apr 2013 Posts: 41 City/Region: Bellingham
State or Province: WA
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Posted: Sat Feb 28, 2015 1:59 am Post subject: |
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I used the sikaflex today to mount a davit on a swim platform and at about 47 degrees it was thick and sticky, but flowed nicely. It will take at least 24 hours to cure. Many thanks for your thoughts. Larry |
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