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Bama Pod View Drop Down
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Joined: 04 Oct 2016
Location: Huntsville AL
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Posts: 89 		Direct Link To This Post Topic: Roof caulking
    Posted: 16 Feb 2017 at 3:44pm
"been lurking in the gravel driveway just waiting for a chance to attack" LOL
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2017 Ford F250
2017 Airstream 26U
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furpod View Drop Down
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Joined: 25 Jul 2011
Location: Central KY
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Posts: 6128 		Direct Link To This Post Posted: 16 Feb 2017 at 1:59pm
Originally posted by Don Halas

Is it best to remove the old caulking first and apply the new, or is it sufficient to apply over the old stuff. If that's the case should there be any prep of the old caulking first?


When dealing with the areas that have caulk, you must remove the old. All of it. It won't stick to itself. But lap sealant is a whole other critter. It will stick to itself, and remains pliable and sticky for years.. heck, decades.

Just a couple weeks ago I picked a little wad out of my shoe tread, that was pulled from the roof on our '79 Airstream, about 6 years ago, and has been lurking in the gravel driveway just waiting for a chance to attack. As far as I could tell, it had been applied to the camper when new.
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texman View Drop Down
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Joined: 24 Jul 2014
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Posts: 446 		Direct Link To This Post Posted: 16 Feb 2017 at 1:05pm
Thanks Furpod
I learned something new
TexMan 2015 182g
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Don Halas View Drop Down
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Joined: 01 Jul 2015
Location: Connecticut
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Posts: 190 		Direct Link To This Post Posted: 16 Feb 2017 at 11:58am
Is it best to remove the old caulking first and apply the new, or is it sufficient to apply over the old stuff. If that's the case should there be any prep of the old caulking first?
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furpod View Drop Down
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Joined: 25 Jul 2011
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Posts: 6128 		Direct Link To This Post Posted: 16 Feb 2017 at 11:58am
No.. Around those areas you use self leveling sealant, or "lap sealant". Just wipe down what is there with some alcohol to clean it up, and lay new over. Unlike silicone, lap sealant will stick to itself.
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texman View Drop Down
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Posts: 446 		Direct Link To This Post Posted: 16 Feb 2017 at 10:40am
scrape it off and use some good outdoor caulk.  this stuff is good, from lowes.OSI QUAD Quad 10-oz Beige Paintable Solvent-Based Window and Door Caulk
TexMan 2015 182g
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Joined: 01 Jan 2017
Location: S caroline
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Posts: 117 		Direct Link To This Post Posted: 16 Feb 2017 at 10:32am
The caulking on my roof around the plumbing vent and fan vent is cracking.Any thouts
Jk Aiken South Carolina 2016 178 Toyota Tundra 2017 4.6
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