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Car Forum / Saab Cars / October 2005

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[Saab_c900] how to remove silicone sealant off paintwork. 8-)

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Craig's Saab C900 Site - 14 Oct 2005 06:43 GMT
Hi everyone,

My 4 y/o daughter smeared some silcone sealant over the paintwork of the
1985 900i I'm fixing up two days ago and I've noticed today because she
put it on the back of the boot lid which I haven't needed to look at until
just now (checking in the boot to get some spare parts out of a box)!

How can I remove the silicone (which is now fully cured!) without ruining
the paint? Will something like acetone work? I'm not keen on using any
physical device to remove it since it'll be next to impossible to avoid
scratching/damaging the paint layer.

Any ideas appreciated! I'll grab some pics with the digital camera and put
them online later on today (will give the link when that's done). 8-)

Thanks,

Craig.

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Craig's Saab C900 Page --> http://lios.apana.org.au/~c900 Sydney, NSW Australia
 Craig's Classic Saab Workshop -- For Saab 99/C900/9000 Enthusiasts world-wide!
  http://www.saab900classic.net http://www.saab900.org c900@lios.apana.org.au
  Come and explore our site, and check out our web-forums, mailing list, etc.

Grunff - 14 Oct 2005 07:26 GMT
> How can I remove the silicone (which is now fully cured!) without
> ruining the paint?

> Will something like acetone work?

No.

> I'm not keen on
> using any physical device to remove it since it'll be next to impossible
> to avoid scratching/damaging the paint layer.
>
> Any ideas appreciated! I'll grab some pics with the digital camera and
> put them online later on today (will give the link when that's done). 8-)

Hardly anything dissovles cured silicone. Your only bet is sulphonic acid.

In the UK, you can get sulphonic acid based silicone removers, such as
<http://www.screwfix.com/app/sfd/cat/pro.jsp?id=18504&ts=71040>

I'm sure you can get these down under too.

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Grunff

David Taylor - 14 Oct 2005 09:06 GMT
> How can I remove the silicone (which is now fully cured!) without ruining
> the paint? Will something like acetone work? I'm not keen on using any

You can buy silicone sealant remover from the DIY shops, try the
bathroom section where they sell the sealant.

I'd try it first on a hidden area to make sure it's not going to
dissolve the paint too. :)

David.
Dexter J - 14 Oct 2005 15:30 GMT
Salutations:

Depending on how it's on (rough smear is bad - a running bead is good) and what class of silicone it is (rubbery is good - hard is bad) I have a couple of options that worked for me.

Standing by for pix.

--

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> Hi everyone,
>
[quoted text clipped - 14 lines]
>
> Craig.
Craig's Saab C900 Site - 15 Oct 2005 04:34 GMT
>Salutations:

>Depending on how it's on (rough smear is bad - a running bead is good) and
>what class of silicone it is (rubbery is good - hard is bad) I have a
>couple of options that worked for me.

Some people have suggested special silicone release agents so that might be
the way to go. Will try on hidden paint areas first though. 8-)

>Standing by for pix.

They're at:

http://www.saab900classic.net/gallery2/main.php?g2_view=core.ShowItem&g2_itemId=
152&g2_page=3&g2_navId=x0ca3574e


Regards,

Craig.
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Craig's Saab C900 Page --> http://lios.apana.org.au/~c900 Sydney, NSW Australia
Craig's Classic Saab Workshop -- For Saab 99/C900/9000 Enthusiasts world-wide!
 http://www.saab900classic.net http://www.saab900.org c900@lios.apana.org.au
 Come and explore our site, and check out our web-forums, mailing list, etc.

Dexter J - 15 Oct 2005 16:28 GMT
Salutations:

>> Salutations:
>
[quoted text clipped - 14 lines]
>
> Craig.

It is as I feared, it's smeared and it looks a lot like latex silicone rather than plastic. Worse yet - that finish looks like it hasn't seen wax in a long time. So, regardless of what I suggest, be aware that you may end up with a tell-tale stain until you refinish the paint. If it is not a latex silicone, use paint thinner instead of water in the instruction below.

Where you have deep goop, get yourself a hypodermic and carefully slide sideways it under the skin - then inject as much fluid under the skin as it will take. You need to get below the silicone, but try not to scratch the paint. If you are under the silicone, the pressure should blister the material enough to break the blister and get a peelable edge from the centre. This will work better the sooner you get to it because the material is curing from the outside in. Peel away as much as you can this way.

Once you get off as much as you can by rolling out from the blister, cut yourself some plastic squares an inch or two larger than smears. Cut a couple of white paper sheets (no inks whatsoever) and soak them. Lay the paper over the silicone and tape the plastic sheets to the panels so as to seal the wet material over the silicone. If you can, leave it out in the sun or under a warm lamp for about 12-16 hours. What you are trying to do is get the humidity up in the paint finish and get the paper to bind a bit with the silicone.

Finally, remove the plastic sheet and use a heat gun or a hairdryer and warm up the silicone to as warm as you can and still touch it comfortably. If you are using thinners - let it air a little bit before heating it. Patience is a virtue here. Too much heat too quickly and you it will turn hard - too little, too long and you will dry it out.

Keep testing it at a likely edge because at some point you should be able to roll the silicone off with the flat palm of your hand. Keep working at it as deeper stuff will take longer, thinner stuff will come up more quickly.

Not that this is at all helpful at this point, but it is always *very* wise to completely paste wax an automobile before you start any deep work like pulling the engine or interior or beginning a restoration.

It would have helped you in this instance because the silicone would have bonded to the wax rather than the paint and a little heat would have seen the wax release the material. Wax is even more helpful if you splash oil on the body or leave a hand print somewhere.

Best of luck Brother Craig - for whatever it might be worth, the little one was just trying to be helpful. I'd encourage it myself as soon as they can safely work a sanding block.

.. :) ..

Cheers.

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James Sweet - 15 Oct 2005 18:24 GMT
> It is as I feared, it's smeared and it looks a lot like latex silicone rather than plastic. Worse yet - that finish looks like it hasn't seen wax
in a long time. So, regardless of what I suggest, be aware that you may end
up with a tell-tale stain until you >refinish the paint. If it is not a
latex silicone, use paint thinner instead of water in the instruction below.

There's latex and there's silicone, they're two rather different types of
caulk, it's either one or the other.
Craig's Saab C900 Site - 21 Oct 2005 01:35 GMT
>It is as I feared, it's smeared and it looks a lot like latex silicone
>rather than plastic. Worse yet - that finish looks like it hasn't seen wax
>in a long time. So, regardless of what I suggest, be aware that you may end
>up with a tell-tale stain until you refinish the paint. If it is not a
>latex silicone, use paint thinner instead of water in the instruction
>below.

I didn't know there was any difference - it's just normal (as far as I can
tell) clear silicone sealant sold in hardware stores, etc. as 'roof and
gutter sealant' since that's what the guys who did the roof were using.

I've got a day off work tomorrow and will have a go at gently trying to peel
some of it off to see how much it's bonded to the paint. Some other people
have suggested seeking out specialist silicone release agents so I might
give that a try too and make sure it won't attack the paint before going at
the sealant.

>It would have helped you in this instance because the silicone would have
>bonded to the wax rather than the paint and a little heat would have seen
>the wax release the material. Wax is even more helpful if you splash oil on
>the body or leave a hand print somewhere.

Yes that's very true, but I haven't waxed the car at all as it's not really
in good enough condition at the moment. The previous owner went crazy
buffing and actually buffed so much that the paint came right off on folds
and edges so there is raw metal in a lot of places. I've dealt with that
using rust converter, etc. and as time permits I sand and repaint with a
gloss aerosol that's as far as I can tell a spot-on match for the current
shade of the paint.

>Best of luck Brother Craig - for whatever it might be worth, the little one
>was just trying to be helpful. I'd encourage it myself as soon as they can
>safely work a sanding block.

Yeah I know she thought she was being helpful. 8-)

Regards,

Craig.
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Craig's Saab C900 Page --> http://lios.apana.org.au/~c900 Sydney, NSW Australia
Craig's Classic Saab Workshop -- For Saab 99/C900/9000 Enthusiasts world-wide!
 http://www.saab900classic.net http://www.saab900.org c900@lios.apana.org.au
 Come and explore our site, and check out our web-forums, mailing list, etc.

James Sweet - 15 Oct 2005 02:53 GMT
> Hi everyone,
>
[quoted text clipped - 14 lines]
>
> Craig.

Silicone is very resilient stuff, nothing will dissolve it that won't
completely destroy the paint. Your best bet is probably to rub it off with
your finger, that usually works pretty well.
Al - 15 Oct 2005 19:11 GMT
>> Hi everyone,
>>
[quoted text clipped - 20 lines]
> completely destroy the paint. Your best bet is probably to rub it off with
> your finger, that usually works pretty well.

Ain't kids great? 8-o

I would recommend the silicone remover.  If it stuffs up the paint, well you
were only going to have to pick it off anyway.

Al

Al
John Hudson - 16 Oct 2005 17:54 GMT
> I would recommend the silicone remover.  If it stuffs up the paint, well you
> were only going to have to pick it off anyway.

Why would you recommend the above? I presume you have tried the silicone
remover on car bodywork?
Al - 19 Oct 2005 20:43 GMT
>> I would recommend the silicone remover.  If it stuffs up the paint, well
> you
>> were only going to have to pick it off anyway.
>>
> Why would you recommend the above? I presume you have tried the silicone
> remover on car bodywork?

No,
read the post the whole post and nothing but the post....THEN read between
the lines!  I know I do have a tendency to expect people to do that, but I
kind of expect most people on this group to be OK with it. So far none of
the regulars has exhibited the stupid gene.  Plenty of people with the
grumpy old men gene though....;-)

From personal experience I know silicone remover works well on ceramic
tiles, etched glass and an acrylic shower tray.  i.e. it gets it off without
damaging any of the aforementioned materials.

It may damage car paintwork, but then if you don't use silicone remover,
without actually sanding the paintwork I can't see any other way of doing
it.  Silicone is a bl*%dy nightmare to remove and there would definitely be
a tell tale shadow on the area affected if you just picked it off.  Maybe if
his 4yr old had done a nice bead instead of a smear he would be better off.
Four year olds, again in my personal experience, are not that clever or
accommodating!

At a guess I reckon he'd be OK with the remover, but then that's what
putting a post up is all about isn't it?  Get lot's of ideas and pick those
you judge to be the best.  I'm guessing with advice from other posters above
here he'll try it on a discrete under the boot floor area first to see if it
has a detrimental effect.

BTW, silicone remover needs to be left on for HOURS, left it overnight,
after carefully removing the big lumps with a Stanley knife...

Cheers for now

Al

P.S.    OP sorry but my newsreader has lost the original post now, so if
you're a she not a he, my sincere apologies!
Craig's Saab C900 Site - 21 Oct 2005 01:57 GMT
>Ain't kids great? 8-o

Yeah they're worth all the effort.

>I would recommend the silicone remover.  If it stuffs up the paint, well you
>were only going to have to pick it off anyway.

That's true, but the paintwork is not that bad apart from the
high-intensity buffing damage that's brought bare metal to the surface. I'm
going to work on the exterior finish later in the year. Currently I'm eyeing
off a nice 1983 C900 turbo that's for sale not too far from here.

Craig.

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Craig's Saab C900 Page --> http://lios.apana.org.au/~c900 Sydney, NSW Australia
Craig's Classic Saab Workshop -- For Saab 99/C900/9000 Enthusiasts world-wide!
 http://www.saab900classic.net http://www.saab900.org c900@lios.apana.org.au
 Come and explore our site, and check out our web-forums, mailing list, etc.

 
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