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Old 07-10-2012, 07:49 PM   #1
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Vent sealant

Does anyone know what is used to seal the fans and vents on the roof (Fiberglass)? Ours has started to leak when it rains. I crawled up there today and it looks like the sealant was poured around the fan. It is probably 3/8 to 1/2 inch thick in places and is starting to crack. Is it the Dyco 20/20 seam sealant? I am thinking of using the Eternabond tape. Anyone got any better ideas? I was going to call Smith Center today, but somebody forgot to charge my cell phone.
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Old 07-10-2012, 10:50 PM   #2
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It may be the ever-popular Dicor, Self-Leveling Formula.

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Old 07-10-2012, 11:35 PM   #3
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Quote:
Originally Posted by unfinished91 View Post
Does anyone know what is used to seal the fans and vents on the roof (Fiberglass)? Ours has started to leak when it rains. I crawled up there today and it looks like the sealant was poured around the fan. It is probably 3/8 to 1/2 inch thick in places and is starting to crack. Is it the Dyco 20/20 seam sealant? I am thinking of using the Eternabond tape. Anyone got any better ideas? I was going to call Smith Center today, but somebody forgot to charge my cell phone.

Tommy,

I'm not sure, but I'm guessing the fan frame to roof is lined with butyl tape and then the top part of the frame (exposed to the elements) and screws are covered with Dicor self leveling caulk. Eternabond is one way to fix the issue, but you have to remove all the existing Dicor and cleaned very well for the Etape to stick. I'm surprised the original Dicor is cracked and leaking water. Usually it lasts a pretty good while. Let us know how it goes. rockin'
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Old 07-14-2012, 02:32 PM   #4
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As it turns out, it is Dicor 501 self-leveling sealant. Very simple to repair, just clean the cracks with mineral spirits and put some more on top of the cracks. It looks like a professional did it. Actually a professional did do it, my wife paid me a dollar just to see me on top of the trailer.
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Old 07-16-2012, 02:59 PM   #5
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I don't think I would use mineral spirits to clean the surface before apling the sealant. Alcohol is the preferred cleaned and it will do good job of getting the crud remove and drys quickly. Mineral spirits will leave an oily residue.

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Old 07-16-2012, 04:59 PM   #6
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I don't think I would use mineral spirits to clean the surface before apling the sealant. Alcohol is the preferred cleaned and it will do good job of getting the crud remove and drys quickly. Mineral spirits will leave an oily residue.

Dan
In many situations I use mineral spirits and then come behind with a clean up of alcohol to remove the oily residue. Works for me. Alcohol just doesn't cut some things very well like butyl tape.
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Old 07-16-2012, 10:39 PM   #7
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I don't think I would use mineral spirits to clean the surface before apling the sealant. Alcohol is the preferred cleaned and it will do good job of getting the crud remove and drys quickly. Mineral spirits will leave an oily residue.

Dan
The instructional video that I saw on using Dicor specifically called for using mineral spirits to clean the area. The Dicor instructions on the tube just say to clean the area, it makes no mention of what to clean it with.
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Old 07-16-2012, 10:47 PM   #8
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AFAIK you can put Eternabond right over the Dicor if it's cleaned as above.
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