Removing old silicone - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 24 Old 05-16-2009 Thread Starter
aspiring sailor
 
Join Date: Mar 2007
Location: just south of Boston
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Removing old silicone

I am changing my deck mounted running lights; the old lights were "bedded" with about 1/2" of silicone. I've managed to get a lot of it off, but the last bit doesn't want to go. What is the best way to get this off? I've tried vinegar, IPA and scraping. . .

Pat
Boston Harbor, MA
1981 Hunter 33
fiestaMojo is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 24 Old 05-16-2009
Sea Slacker
 
Join Date: Jan 2007
Posts: 1,789
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
No chemical will help.
My own process for removing silicone is:
1) using a chisel on the largest amounts
2) using a knife (I have an old kitchen "steak" type knife with a relatively flexible blade) on what remains
3) using sandpaper on the surface to remove the "residue" (check by wiping some water on it - if water no longer "beads" or "pools" - silicone is finally gone).

While doing that, I keep cursing the PO and whoever was the first dumass that thought up the idea of using silicone as a sealant on a boat.

(Just had to rebed the dorade boxes and, you guessed it, more silicone)
brak is offline  
Quote Quick Reply Share with Facebook
post #3 of 24 Old 05-16-2009
Here .. Pull this
 
Join Date: Jan 2007
Posts: 2,031
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Acetone helps
Sailormann is offline  
Quote Quick Reply Share with Facebook
post #4 of 24 Old 05-16-2009
Sea Slacker
 
Join Date: Jan 2007
Posts: 1,789
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Quote:
Originally Posted by Sailormann View Post
Acetone helps
I used to think that

That said, it does help in some cases if silicone is applied over something like paint that can be dissolved by acetone - in which case silicone may somewhat come off with underlying material. This does not generally help on FRP.
brak is offline  
Quote Quick Reply Share with Facebook
post #5 of 24 Old 05-16-2009
Senior Member
 
Join Date: Jan 2008
Posts: 438
Thanks: 3
Thanked 8 Times in 8 Posts
Rep Power: 8
 
Supprisingly WD 40 seems to work and is safe on most (all?) surfaces.
noelex77 is offline  
Quote Quick Reply Share with Facebook
post #6 of 24 Old 05-16-2009
Sea Slacker
 
Join Date: Jan 2007
Posts: 1,789
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Quote:
Originally Posted by noelex77 View Post
Supprisingly WD 40 seems to work and is safe on most (all?) surfaces.
Curious. I would guess it also breaks the bond between silicone and the surface - but I'd like to try it.
brak is offline  
Quote Quick Reply Share with Facebook
post #7 of 24 Old 05-16-2009
Here .. Pull this
 
Join Date: Jan 2007
Posts: 2,031
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Quote:
That said, it does help in some cases if silicone is applied over something like paint that can be dissolved by acetone - in which case silicone may somewhat come off with underlying material. This does not generally help on FRP.
Geez - guess the sink in my head must have been painted
Sailormann is offline  
Quote Quick Reply Share with Facebook
post #8 of 24 Old 05-16-2009
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Unfortunately, the oil from the silicone is a pernicious contaminant on fiberglass and very difficult to get rid of. If you think you've gotten rid of it all—an easy way to check is to pour water over the surface.... if it beads at all, instead of wetting the surface, you failed.

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.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #9 of 24 Old 05-17-2009 Thread Starter
aspiring sailor
 
Join Date: Mar 2007
Location: just south of Boston
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thanks all for the input, when it stops raining I'll be back at it. . .

Pat
Boston Harbor, MA
1981 Hunter 33
fiestaMojo is offline  
Quote Quick Reply Share with Facebook
post #10 of 24 Old 05-17-2009
Senior Member
 
Join Date: Feb 2005
Posts: 1,077
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 11
 
is it silicone or 5200?just a lot of elbow grease and liquid dish soap seems about the only answer I know of
sawingknots is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Tips For Compound, Polish & Wax Maine Sail Gear & Maintenance 254 5 Days Ago 10:25 AM
Rebeding Chain plate deck penetrations Stillraining Gear & Maintenance 37 02-21-2009 05:01 PM
Removing Silicone seatrek Gear & Maintenance 3 05-18-2004 05:59 AM
Techniques for Removing Teak Decks Sue & Larry Buying a Boat Articles 0 11-24-2003 07:00 PM
removing old silicone caulking bmcald Gear & Maintenance 3 03-20-2003 04:26 AM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome