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Old 03-09-2008, 03:57 PM   #1
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silicone not okay for exterior paint?


I've used 100% silicone for a small number of exterior projects, and had planned to use it for sealing everything in a exterior paint job. But in one of these posts I've read that silicone does not hold paint well and should not be used in paint projects.

Is that true?

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Old 03-09-2008, 05:01 PM   #2
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silicone not okay for exterior paint?


Sadly....for you, the answer is: Yes, silicone will not hold paint.

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Old 03-09-2008, 05:47 PM   #3
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silicone not okay for exterior paint?


GE makes a paintable silicone caulk. It is called "Silicone ll XST". It can be used indoors or outdoors. I can't say that I am a fan of silicone caulk, however. At least this brand. I have caulked for years without ever having a problem. I just remodeled a small bathroom from the studs out; tub, vanity, toilet, 6" tile surround over Hardibacker, drywall and laminate flooring. So, I am not inept. It turned out great, except for the caulk around the tub. It kicked by butt. I will remove it and redo it when I have the patience.

Last edited by Handyman50; 03-09-2008 at 05:52 PM.
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Old 03-09-2008, 06:16 PM   #4
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silicone not okay for exterior paint?


There are also other brands of paintable silicone.
Also Latex-based exterior caulk, with silicone added, that are also paintable.
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Old 03-09-2008, 07:19 PM   #5
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silicone not okay for exterior paint?


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GE makes a paintable silicone caulk. It is called "Silicone ll XST". It can be used indoors or outdoors. I can't say that I am a fan of silicone caulk, however....

It turned out great, except for the caulk around the tub. It kicked by butt. I will remove it and redo it when I have the patience.
Amen on the GE Silicone Bathroom caulk! I tried that a couple of years ago, and not only was it a royal pain in the rear to apply and looked awful, it indelibly mildewed up in just a few months, just like any other caulk. So much for the "lifetime guarantee".

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Old 03-09-2008, 09:14 PM   #6
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silicone not okay for exterior paint?


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Amen on the GE Silicone Bathroom caulk! I tried that a couple of years ago, and not only was it a royal pain in the rear to apply and looked awful, it indelibly mildewed up in just a few months, just like any other caulk. So much for the "lifetime guarantee".

SirWired
I am glad that I am not the only one who had problems with it. I was feeling like a failure. Some products, no matter who the manufacturer is, can be duds. This is one prime example.
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Old 03-09-2008, 09:21 PM   #7
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silicone not okay for exterior paint?


Silicone is not paintable. But there are plenty of high performance , paintable products out there, most readily available are the polyurethanes. Talk to someone at a real paint store, like Sherwin Williams or Benjamin Moore, or contact a local commercial waterproofing supplier.
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Old 03-09-2008, 09:28 PM   #8
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silicone not okay for exterior paint?


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... 100% silicone...
Argh...all the hairs on the back on my neck stood up and I got a chill
Please don't post those words on a paint forum, or shout them at a paint convention, or whisper them in a Painter's bar
You could get damaged

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I...had planned to use it for sealing everything in a exterior paint job.
Ahhhhhh!!!!!!

Now I feel like bugs are crawling on me....stop saying stuff like that
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Originally Posted by darsunt View Post
....I've read that silicone does not hold paint well and should not be used in paint projects.
Good thing you read that

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Is that true?
No...it should read rather than "well" it should read "at all"
If it said that, then it would be true
One of the reasons we want to do all our own prep
You just don't want to show up at a job and find that stuff everywhere
It's horrifying

Siliconized latex caulk, however, is great



Re: GE caulk
Once you've had an entire house's GE caulk fail, you'll never ever touch GE caulk again (as one did out here-not mine but still horrifying)
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Old 03-09-2008, 09:42 PM   #9
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silicone not okay for exterior paint?


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Re: GE caulk
Once you've had an entire house's GE caulk fail, you'll never ever touch GE caulk again (as one did out here-not mine but still horrifying)
Don't worry, I will never touch the stuff again. Fool me once, shame on you. Fool me twice, shame on me.
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Old 03-09-2008, 10:33 PM   #10
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silicone not okay for exterior paint?


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I am glad that I am not the only one who had problems with it. I was feeling like a failure. Some products, no matter who the manufacturer is, can be duds. This is one prime example.
For caulking in bathrooms and kitchens I have had excellent results with DAP Kwik Seal and DAP Kwik Seal Plus, either white or clear. Both are an adhesive as well so I can use only one caulk for vanity top and backsplash installations and caulking afterwards. Water cleanup, smooths out nicely, looks great. Polyseamseal is a hit or miss affair. If silicone was used originally I use the GE Silicone II when I'm doing only a small area or caulk line repair. But, most faucet and tub surround manfacturers specify silicone for installations so it definitely has its place.
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Old 03-10-2008, 05:52 AM   #11
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silicone not okay for exterior paint?


One of the best silicone replacements I've used is Sashco Lexel. It's messier to work with since it's rather tacky but it's a moisture cured urethane caulk. It outperforms silicone and is completely paintable.
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Old 03-10-2008, 06:31 AM   #12
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silicone not okay for exterior paint?


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One of the best silicone replacements I've used is Sashco Lexel. It's messier to work with since it's rather tacky but it's a moisture cured urethane caulk. It outperforms silicone and is completely paintable.
We just used that product about 2 weeks ago, in a kitchen remodel. It is def very tacky, and man, does that stuff smell. It's got a very strong petroleum odor.
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Old 03-12-2008, 12:06 AM   #13
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silicone not okay for exterior paint?


I'm using DAP Dnyaflex 230 on a deck & fencing job. This, along with any premium caulking - above say, garbage interior 'painter's caulk, or the standard go-to DAP ALEX - is a bear to apply. The 230 has a tooling time measured in less than a minute. Plan on having a full box of painter's rags around since it will get everywhere.

Personally, I consider that a good thing, since it cures up rock hard, and with the 50 yr guaranty should last for decades.

The G.E. XST takes at least 2 coats of paint to hide. It's very stringy and messy to apply; best suited for hidden or semi-hidden app's. Personally, I have no doubt that it is very bullet-proof once installed and cured.
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Old 03-12-2008, 04:19 PM   #14
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silicone not okay for exterior paint?


Can 230 make a good seal between wood and concrete?
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Old 03-14-2008, 10:56 AM   #15
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silicone not okay for exterior paint?


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Can 230 make a good seal between wood and concrete?
I'd contact DAP tech support...

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