The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Search

Notices

Random Quote: You're born, you live and you die and in between you should go fishing as often as possible!
Reply
 
Thread Tools Search this Thread
Old 05-19-2010, 03:56 AM
  #1    
Junior Member
 
Join Date: Apr 2009
Posts: 9
Default Best caulk for boat seams

Anybody have any thoughts on the best marine caulk to use on exterior boat seams.
I have a 25yr. old fiberglass lobster boat that has seams that need to be recaulked
around the pilothouse. My concern is future removal and non-yellowing. I'm
thinking a Boatlife product but notsure which one. Thanks
scallywag is offline   Reply With Quote
Old 05-19-2010, 04:14 AM
  #2    
Admirals Club
 
Join Date: Sep 2009
Location: Nottingham, MD
Posts: 1,193
Send a message via Yahoo to bfox76
Default

The 3M 4000 UV is a great product, but it does yellow. I used it on all my hatches not too long ago. It provides great flexibility and movement with the boat, but if water sits in an area on a joint, it will yellow.

3M 5200 will be too permanent, IMO. I used it when I put my T-Top back on and have noticed that it yellows as well.

I asked the same question on here, not too long ago. Here is the link: http://www.thehulltruth.com/boating-...-silicone.html


Good Luck.
__________________
LTD
Living The Dream, but somedays, its not always my dream!

2010 F150 SCREW Lariat w/ 4x4 OFF ROAD PACKAGE
2009 (2) Yamaha FX HO Waverunners
1986 Biddison 1800 - SOLD - http://www.thehulltruth.com/boating-...highlight=OSBP
1977 Classic Mako 25 - WAS A PROJECT - SOLD http://www.thehulltruth.com/boating-...stringers.html
2006 (2) Yamaha VX110 Deluxe Waverunners - SOLD
bfox76 is offline   Reply With Quote
 
Old 05-19-2010, 04:39 AM
  #3    
Admirals Club
 
Join Date: Feb 2010
Location: Melbourne, FL
Posts: 56
Default

I recently used Boatlife Life-Seal on my exterior seams. They also have Life-Caulk. I use the 3M products, 4000 or 5000 series, when I need an adhesive to bond two materials together. But I think you are just looking to seal a seam. I would not use an adhesive for that.
__________________
Luhrs 35 Convertible
Wellcraft 180 Fisherman
CaptainJR is offline   Reply With Quote
Old 05-19-2010, 05:39 AM
  #4    
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tarpon Springs
Posts: 6,316
Default

Ordinary white silicone is about the best thing to use and it will never yellow.
TwentyFourSeven is offline   Reply With Quote
Old 05-19-2010, 05:48 AM
  #5    
Admirals Club
 
Join Date: Apr 2009
Posts: 1,197
Default

Boatlife- Life Seal is all I use for non adhesive applications. Both above and below the water line. Every time I pot a hole in my boat it gets Life Seal no matter where it is.
" I put that $h_t on everything"
2dogs1949 is offline   Reply With Quote
Old 05-19-2010, 06:04 AM
  #6    
Senior MemberCaptains Club Member
 
Join Date: Aug 2006
Location: LI, NY
Posts: 1,576
Default

Never put household "ordinary white silicone" on a boat... Let alone a commercial Lobster boat... Use 4000 the uv resistance and the fact that you can remove it if you need to...
__________________
'67 Bertram 31' FBC "Summer Winds"
'79 Bertram 31' SEDAN (Cummins)
'76 Bertram 28' 351's (For Sale)
'79 Bertram 35' 3116
1999 Boston Whaler 28' Conquest 2x ox66 (Sold)

-50 Ton master.
Whaler1777 is offline   Reply With Quote
Old 05-19-2010, 10:55 AM
  #7    
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tarpon Springs
Posts: 6,316
Default

Quote:
Originally Posted by Whaler1777 View Post
Never put household "ordinary white silicone" on a boat... Let alone a commercial Lobster boat... ...

Why not, I do it all the time. Works fine and never yellows. I put some on my boat two years ago and its still there.
TwentyFourSeven is offline   Reply With Quote
Old 05-19-2010, 11:59 AM
  #8    
Member
 
Join Date: Nov 2006
Location:
Posts: 30
Default

Quote:
Originally Posted by TwentyFourSeven View Post
Why not, I do it all the time. Works fine and never yellows. I put some on my boat two years ago and its still there.
Because it doesn't have the word "marine" on the label !
bigfished is offline   Reply With Quote
Old 05-19-2010, 06:24 PM
  #9    
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tarpon Springs
Posts: 6,316
Default

Quote:
Originally Posted by bigfished View Post
Because it doesn't have the word "marine" on the label !

Thats the only reason.
TwentyFourSeven is offline   Reply With Quote
Old 05-19-2010, 06:37 PM
  #10    
Senior Member
 
Join Date: Jan 2007
Location: See screen name
Posts: 3,229
Default

Silicon will seep into your gel coat and make any future painting virtually impossible. Silicon has no business EVER being applied to exterior gelcoat and fiberglass. And yes there is "Marine" silicone sealant; use it inside or for things like sealing polycarbonate windows to aluminum frames.

BTW, you can paint over 5200/4200 etc, otherwise they will yellow.

George
Hatteras 56MY
Boston Whaler 130 Sport
caltexflanc is offline   Reply With Quote
Old 05-19-2010, 07:12 PM
  #11    
Senior Member
 
Join Date: Jun 2008
Location:
Posts: 1,768
Default

I bet silicon is just fine but if it makes you warm and fuzzy inside then pay 4X more and use "Marine" silicon.
fishinmaniac is offline   Reply With Quote
Old 05-21-2010, 05:55 PM
  #12    
Senior Member
 
Join Date: Jan 2007
Location: See screen name
Posts: 3,229
Default

Marine or not, it is not fine on gelcoat or any painted fiberglass surface. Period. Why not use the right thing?
caltexflanc is offline   Reply With Quote
Old 05-21-2010, 07:25 PM
  #13    
Senior Member
 
Join Date: Jun 2008
Location:
Posts: 1,768
Default

Have you tried both, just asking?
fishinmaniac is offline   Reply With Quote
Old 05-23-2010, 01:04 PM
  #14    
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tarpon Springs
Posts: 6,316
Default

Quote:
Originally Posted by caltexflanc View Post
Marine or not, it is not fine on gelcoat or any painted fiberglass surface. Period. Why not use the right thing?
Silicone is the right thing it does not yellow, everything else does.
TwentyFourSeven is offline   Reply With Quote
Old 05-23-2010, 02:57 PM
  #15    
Senior Member
 
Join Date: Jan 2007
Location: See screen name
Posts: 3,229
Default

Well, good luck with that. There are plenty of things that work better, don't yellow and are not silicon. It's your boat.....

and yes I have seen directly the damage that silicone sealants do to gelcoat and painted fiberglass.
caltexflanc is offline   Reply With Quote
Old 05-23-2010, 03:09 PM
  #16    
Admirals Club
THT sponsor
 
Join Date: Aug 2005
Location: Venice, Florida
Posts: 15,477
Default

The problem with silicone is that nothing will ever stick to that area again. You will never see a tube of silicone anywhere near a body shop for that very reason.
I actually think doing the seams in black might look nice if they were all sone that way from the beginning. My boat is black and white so it might look nice.
__________________
www.CoolWaterProducts.com
Rod Holder Flagpole with Valley Forge USA or Dive Flag combo sales. $10 off padded anchor bags, and much more.




Mr. Demeanor is offline   Reply With Quote
Old 05-23-2010, 06:31 PM
  #17    
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tarpon Springs
Posts: 6,316
Default

Quote:
Originally Posted by caltexflanc View Post
Well, good luck with that. There are plenty of things that work better, don't yellow and are not silicon..

Such as?
TwentyFourSeven is offline   Reply With Quote
Old 05-12-2013, 07:15 AM
  #18    
Admirals Club
 
Join Date: Mar 2013
Posts: 46
Default

This has created several questions...do you use silicone, marine silicone or something else. The biggest question is my boat is new and needs fixed. There are several gaps under my bumper rail all the way around. How do I know what the factory used before I start applying something else? It looks like a silicone of some kind.
cknlg1 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

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0