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05-18-2008, 02:50 PM
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#1
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,337
M.O.C. #3699
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Exterior Silicone Caulk
Can anyone recommend a good exterior silicone caulk, that if used by the rubber roof works well to give a good seal.
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Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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05-18-2008, 03:12 PM
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#2
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Montana Master
Join Date: Nov 2007
Location: Kville
Posts: 2,865
M.O.C. #7871
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If you have a marine store close by, check there. If works in a marine environment, it will for sure on an RV.
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05-18-2008, 03:38 PM
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#3
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Montana Master
Join Date: Apr 2007
Location: South Shore
Posts: 6,009
M.O.C. #7110
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I'd do some more checking if you are trying to use it on the rubber roof anywhere. I'm fairly certain that silicone will not bond with rubber. I had someone redo the joints on a rubber roof I had once and found out later that they used a silicone base caulking and not long after that I discovered one area that just peeled right off where they made repairs.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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05-18-2008, 03:46 PM
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#4
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Montana Master
Join Date: May 2006
Location: Oakland
Posts: 887
M.O.C. #5811
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Use Dicor caulking if you are caulking around the rubber roof.
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05-18-2008, 04:12 PM
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#5
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Montana Master
Join Date: Apr 2004
Location: Apple Valley
Posts: 1,574
M.O.C. #1358
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Yup...what the others said...silicone is a fine product, but that is not the proper application for it.
A Butyl based caulk is what you want for around the rubber roof (and windows too I believe). It sure wouldn't hurt to talk with a rep at Dicor...
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05-18-2008, 05:54 PM
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#6
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Montana Master
Join Date: Aug 2004
Location: Cedar Rapids
Posts: 4,876
M.O.C. #1944
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Silicone products are a no-no for rubber roofs. I've always used Dicor products, as recommended by the roof manufacturer (Dicor, of course).
Orv
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05-18-2008, 06:03 PM
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#7
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Site Team
Join Date: Aug 2007
Location: Omaha
Posts: 6,795
M.O.C. #7560
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Nailbender beat me to it! Dicor is the right stuff! You can find it at any good RV dealership and also at Camping World. It is excellent and will bond forever where the silicone caulk will not at all on the rubber roof that is!
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05-18-2008, 06:49 PM
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#8
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Montana Master
Join Date: Aug 2006
Location: Lone Tree
Posts: 5,615
M.O.C. #6109
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Dicor works great - be careful that there are two kinds. Non-Sag is for running a bead on a vertical surface and the self leveling lap sealant is for sealing items on top of the roof.
I used the self leveling to install the additonal fantastic vent and satellite dome.
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05-19-2008, 06:25 AM
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#9
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Montana Master
Join Date: Aug 2004
Location: Asheville
Posts: 502
M.O.C. #1967
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Don't use anything that is not made for the rubber roofs, nothing from the hardware stores. That from the RV man that did my Dometic recall this weekend. Won't stick, what does stick causes problems and these guys hate it. No silicone for sure. RV only.
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05-19-2008, 02:18 PM
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#10
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Montana Master
Join Date: Aug 2006
Location: merced
Posts: 983
M.O.C. #6171
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Brad is right, be sure to get the correct type, the self leveling is great on flat or almost flat areas of the roofs. But not on the edges or around windows, it won't work.
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05-21-2008, 01:05 PM
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#11
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Montana Fan
Join Date: Jan 2004
Location: Marshfield
Posts: 158
M.O.C. #886
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Our trailer came from the factory with a silicone caulk on the rubber roof around the radius corners and all the way down both sides. I took it to the dealer and he said it's ok if the factory did it. All of the flat top was done with Dicor self-leveling caulk. We have used DAP silicone caulk with Titanium for recaulking areas that originally had silicone. I have not tried the Dicor no-sag caulk, but it might work. The Dicor self-leveling sure does a nice job and it is a bear to remove.
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