Is Marine Silicone any different? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 04-02-2009
Member
 
Join Date: Apr 2008
Location: VA
Posts: 75
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
tausap is on a distinguished road
Is Marine Silicone any different?

I was looking at clear non-adhesive silicone sealant today. The "Marine grade" stuff is much more expensive than the "bathroom" grade at Home Depot. Is there a significant enough difference to pay the extra, or is it just a marketing gimmick?
__________________
Brett
S/V Liberty
1980 Morgan 461
Reply With Quote Share with Facebook
  #2  
Old 04-02-2009
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
What are you using it for. Silicone-based sealants have very little good use on a boat, other than bedding lexan/acrylic glazing, covering the ends of cotter pins and being used on the bottom of dishware to make it non-skid.

Using it on deck hardware is really a bad idea, since all silicone sealants tend to leave behind contaminants that make resealing the area afterwards almost impossible.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #3  
Old 04-02-2009
AllThumbs's Avatar
midlife crisis member
 
Join Date: Jul 2008
Posts: 960
Thanks: 0
Thanked 5 Times in 5 Posts
Rep Power: 7
AllThumbs is on a distinguished road
To answer your question, I don't know, but somehow I doubt they are different. I guess that is not helpful...
__________________
The people who find fault in what you build typically don't build anything at all.
Reply With Quote Share with Facebook
  #4  
Old 04-02-2009
bobmcgov's Avatar
baDumbumbum
 
Join Date: Jul 2007
Location: Windy Wyoming
Posts: 1,022
Thanks: 0
Thanked 24 Times in 23 Posts
Rep Power: 8
bobmcgov will become famous soon enough
Two major kinds of silicone sealants: those with acetic acid (vinegar), and those without. You want the kind without, as the acetic acid can really pit and corrode marine fittings. If you are sure this is a job for silicone (as SD says, it's right for very few boat jobs), use GE Silicone II Sealant, available at your local hardware store. Still about $6 a tube. GE Silicone I is acetic-based, so don't use that.
__________________
Buccaneer18, Grainnia
SJ21, Diarmuid
Albin Ballad 30, Fionn
Reply With Quote Share with Facebook
  #5  
Old 04-03-2009
nightowle's Avatar
Senior Member
 
Join Date: Aug 2006
Posts: 226
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 8
nightowle is on a distinguished road
learning these seemingly small facts is what makes this forum great. I just love picking up these tips! Now I just have think where I may have used the vinegar smelling silicone around the boat!!!! oops!
__________________
________
S/V Don't Panic!
O'Day 27
Seattle, WA

“Navigare necesse est, vivere non est necesse” To Sail is vital, to live is not.
Reply With Quote Share with Facebook
  #6  
Old 04-03-2009
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
The problem with the acetic acid-based silicone is that it tends to attack metals... because of the acid. Fortunately, acetic acid isn't all that aggressive an acid.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #7  
Old 04-03-2009
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
scottyt is on a distinguished road
i have a tube of this stuff on board as my general sealing/adhesive stuff ( also have 4200 ). it a liquid nails product, that is very clear when cured. it sets up pretty quick and is not hard to remove later. if i had to give it a 3m comparison i would say its a little weaker than 4200 but has better flexibility. i used it to seal the plex on my roof hatch, and you have to look to see it. i see it as my 4200 replacement when i dont want the white or want it clear.
Reply With Quote Share with Facebook
  #8  
Old 04-03-2009
jarcher's Avatar
Senior Member
 
Join Date: Jul 2008
Location: Smithfield, RI
Posts: 986
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
jarcher is on a distinguished road
What about the hybreds?

This seems like a good thread to ask this... What about those sealants that are half silicon and half something else? It would seem that they have the same issue as silicon (contaminating fiberglass) but many people use lifecaulk and other hybreds.
Reply With Quote Share with Facebook
  #9  
Old 04-03-2009
Senior Member
 
Join Date: Dec 2007
Posts: 201
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
jason3317 is on a distinguished road
Spinlock specifically points out in their documentation that polysulphides and urethanes should NOT be used to bed their rope clutches; they want silicone to be used. Reasoning provided is that the polys will degrade the plastic materials? So, I will hope that I never have to rebed.

How do you clean the contaminant residue left behind to get a good seal when rebedding?
Reply With Quote Share with Facebook
  #10  
Old 04-03-2009
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,264
Thanks: 9
Thanked 111 Times in 81 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Silicone

Quote:
Originally Posted by jason3317 View Post

How do you clean the contaminant residue left behind to get a good seal when rebedding?
You will need to sand it after removing as much as you can by hand. Tape off the areas you don't want sanded and then sand the contaminated area. Certain plastics can have the plasticizers leeched out of them over time from products like polysulfides. This leeching makes the brittle and more prone to failure. In these situations I would recommend Dow 795 as the Silicone of choice..


As Dog stated silicone has very, very few good uses on a boat. Certain plastics require it because they can be attacked by Polysulfides, Polyurethanes or Polyethers.

The problem with Silicone is that it nearly permanently contaminates a surface. Even when you think it is gone and you've rubbed it away it is still there. Simply use a spray bottle, like for ironing, and mist the surface it the water beads the surface is contaminated.

Silicone was and is designed to resist attack by most all chemicals. None of the commercially, body shop strength, removers are really all that safe for fiberglass and even they don't work all that well even on metal.

Once you've used silicone it will be very tough to get anything else will stick to where you had the silicone.

There are also MANY grades of silicone and it goes much deeper than just marine or bath tub. Acrylic hatches should only ever be sealed with Dow 795 or GE SG4000 as these are "structural grade" Silicone products. Bath tub silicone is not even rated as such and should not be used to seal ports or hatches as it is just not safe or prudent behavior.

If you are going to choose a Boat Life product stay away from the combo Life Seal product as you WILL get silicone contamination and choose Life Calk for general bedding uses unless certain plastics like Polycarbonate or Acrylic..

For those of us who have had to atually remove silicone contamination, for paint work, I can asure you the ONLY way to 100% get rid of Silicone contamination of gelcoat is to sand it off.. Just because you can't see it does not mean it is not there, trust me!!
__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 04-03-2009 at 07:37 AM.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
THE Yacht Builder List T37Chef Boat Review and Purchase Forum 26 07-08-2011 05:51 AM
Tartan / C&C issues MarkSchu General Discussion (sailing related) 228 01-19-2009 01:31 AM
Marine Radios Overview Jim Sexton Seamanship Articles 0 09-30-1999 08:00 PM
Marine Radios Overview Jim Sexton Gear and Maintenance Articles 0 09-30-1999 08:00 PM
Marine Radios Overview Jim Sexton Her Sailnet Articles 0 09-30-1999 08:00 PM


All times are GMT -4. The time now is 10:18 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012