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Old 09-27-2016, 08:06 PM   #1
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Silicone...

All of the seal joints on the body of my camper are sealed with silicone... Most of it is in fair condition... Some is good, some is poor, but most is fair.

Can I. Clean it and lap seal over it? Or does it all have to be replaced?
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Old 09-27-2016, 10:37 PM   #2
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Silicone does not seal well to smooth surfaces. IMO it is worse than using ordinary household caulking on an RV.
For example, pull on one end of a bead of silicone on your RV, chances are you will pull it off in one long string/bead.
N sealant, including more silicone will adhere well to old silicone or the residue where it has been removed unless you buy and use the special silicone removal product.
Bottom line, I would remove it all, then use the removal product to clean the complete area. Then seal with Dicor self-leveling for horizontal use or Dicor non-sag for vertical surfaces or a similar product. Eternabond sealing tape
is also a great product for sealing roofs.
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Old 09-27-2016, 11:26 PM   #3
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The problem with using Dicor is that it is white. If you ahve a dark colored coach, it won't look that great.
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Old 09-28-2016, 11:49 AM   #4
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I think Ray is right! It is my understanding that you can't put any other type of caulk over silicone!
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Old 09-29-2016, 09:36 AM   #5
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Dicor is hardly the only sealant available. Geocel Proflex RV, for example, comes in several colors as well as clear. Besides, the common Dicor is a self-leveling sealant, so unsuitable for vertical seams anyway (but there is a non-sag version if you hunt for it).

Anyway, old silicone needs to be removed, since nothing sticks reliably to it (including more silicone). I use it in a few places on the RV, e.g. tops of window frames, but mostly choose other types. 3M Body Seam Seal and Geocel Proflex are two excellent choices.
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Old 09-30-2016, 11:11 AM   #6
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Quote:
Originally Posted by Gary RVRoamer View Post
Dicor is hardly the only sealant available. Geocel Proflex RV, for example, comes in several colors as well as clear. Besides, the common Dicor is a self-leveling sealant, so unsuitable for vertical seams anyway (but there is a non-sag version if you hunt for it).

Anyway, old silicone needs to be removed, since nothing sticks reliably to it (including more silicone). I use it in a few places on the RV, e.g. tops of window frames, but mostly choose other types. 3M Body Seam Seal and Geocel Proflex are two excellent choices.
Agree. I use Geocel Proflex on the vertical surfaces and where color matters.
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Old 09-30-2016, 06:45 PM   #7
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Thanks

Great thread for alternatives to using silicone (which I have grown to greatly dislike). Ya learned an old dog new tricks.
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Old 09-30-2016, 06:58 PM   #8
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My most faithful ever is Geocel MHRV 2300 clear. Hard to find.
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