Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Painting

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-14-2013, 09:05 PM   #31
Painting Contractor CT
 
Join Date: Nov 2012
Location: West Hartford, CT
Posts: 112
Share |
Post

Painting over silicone caulk??


You can either caulk over it and then paint or remove the silicone, caulk and paint.

Good Luck!

KD PAINTING is offline   Reply With Quote
Old 06-14-2013, 09:16 PM   #32
Carpenter/Rehabber
 
moorewarner's Avatar
 
Join Date: Mar 2010
Location: Saint Louis MO
Posts: 37
Default

Painting over silicone caulk??


Quote:
Originally Posted by ccarlisle View Post
In actual fact, that silicone adhesive your friend inadvertently used is a fine example of just how silicones work - well, that is those that are chemically of a certain structure (because not all silicones show adhesive proeprties - but close enough for the sake of this thread).

Silicones like this one attach themselves chemically to the substrate whereas other caulking compounds attach themselves mechanically to the substate. In doing so, silicones can attach themselves to pretty well any substrate much better than other products because they orient themselves in such a way that on one side of the bead (towards the substrate) they stick and on the other side facing you they do the opposite: they repel anything that tries to stick to them...

Chemical bonding and all that...but on the side facing you, you are looking at a very slick surface that as I said repels everything - much like the wax on the hood of your car...products just bead up once they land on a silicone and fall off. They do that by orienting the silicone molecules in such a way that the surface has very low "surface tension". That means everything rolls off it.

To put it into numbers, the silicone surface has a surafce tension somewhere around 30 dynes/cm...water has a higher surface tension around 72 dynes/cm. Now by physiochemical principles, the higher surface tension product (water) cannot remain comfortably on the lower surface tension product (silicone) - and the water rolls off.

Thus the only way to make something stick to a silicone is to give it the same surface tension as the silicone...don't ask how I know that, I just do.

Ta-da... "fluorochemicals" to the rescue!!

If you put "fluorochemicals" into a caulk or a paint, it would stick to silicones. Some products have "fluorochemicals" in them, but they ain't cheap.

Sooooo...95% of the products you try to put over that type of silicone wan't stick for very long. But one or two just might. Either spend your time trying to find that one or two products, or take it out and do it properly.

Here endeth the lesson... Not bad for a Saturday night I gotta get a life...
Am I the only one who's nipples got hard reading that?
moorewarner is offline   Reply With Quote
Old 06-14-2013, 09:18 PM   #33
Carpenter/Rehabber
 
moorewarner's Avatar
 
Join Date: Mar 2010
Location: Saint Louis MO
Posts: 37
Default

Painting over silicone caulk??


Quote:
Originally Posted by KD PAINTING View Post
You can either caulk over it and then paint or remove the silicone, caulk and paint.

Good Luck!
I was going to suggest/ask about this solution. Do you know it to work? Does it work well?
moorewarner is offline   Reply With Quote
Old 06-14-2013, 09:18 PM   #34
Rubbin walls since'79
 
Brushjockey's Avatar
 
Join Date: Mar 2011
Location: Mn
Posts: 2,518
Default

Painting over silicone caulk??


Quote:
Originally Posted by moorewarner View Post
Am I the only one who's nipples got hard reading that?

I think I had a little stiffy myself..
__________________
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS
Brushjockey is offline   Reply With Quote
The Following User Says Thank You to Brushjockey For This Useful Post:
moorewarner (06-14-2013)
Old 06-15-2013, 04:33 AM   #35
paper hanger and painter
 
chrisn's Avatar
 
Join Date: Dec 2007
Location: Hagerstown MD
Posts: 6,650
Default

Painting over silicone caulk??


carlise quotes this( along with a lot of other stuff) ( good stuff)
"Some products have "fluorochemicals" in them, but they ain't cheap. "

got any names?

chrisn is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Recaulking at previously silicone-caulked shower door frame hffeagan Kitchen & Bath Remodeling 35 02-09-2014 01:20 PM
silicone on silicone caulk ponch37300 Kitchen & Bath Remodeling 2 05-09-2009 08:11 AM
How to seal my attic access - airtight? akoch General DIY Discussions 4 09-08-2008 08:03 PM
Recaulking Bathroom Help RaeEllen Remodeling 9 07-25-2008 10:23 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.