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Old 05-20-2014, 04:05 PM   #1
acampbell1999
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Roof leak and repair

We just had a storm blow through and drop 3" of rain the day before we left for our last camping trip. Everything was dry inside and no leaks before we left... I get to the campground and see a puddle of water on the top bunk the saturated the mattress directly under the skylight. I climbed up and see some cracking in the sealant around the skylight. I have been searching but am not 100% sure what sealant I need to buy to seal it up. It is a 2010 bullet 281bhs. Am I to use dicor?

The cracking isn't that bad and the rest of the roof sealant looks good. Do I need to completely remove the old or can I lay sealant on top of what's there? Any help is appreciated.

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Old 05-20-2014, 04:36 PM   #2
Festus2
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Thoroughly clean the existing sealant and then apply self-leveling Dicor roof sealant. There is no need to remove anything.
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Old 05-20-2014, 04:40 PM   #3
acampbell1999
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Thank you, sir. Any issue with using greased lightning or 409 to clean the existing? Or is there something special that I need to buy? Not to be a dunce, I'm just new to this and don't want to do the wrong thing.

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Old 05-20-2014, 04:44 PM   #4
therink
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I would clean real well with hand scrub brush and 409 wipe with rags, and then use small amount of isopropyl alcohol or acetone on a dry rag on old caulk (careful not to get on roof membrane), then recaulk cracked areas with dicor self leveling rv caulk.
I recommend also removing interior sky light lense and inspect roof frame and sheathing at skylight edges for water damage or at least let it dry out.
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Old 05-20-2014, 04:45 PM   #5
acampbell1999
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Perfect. Thanks for the help!

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Old 05-20-2014, 04:46 PM   #6
Festus2
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Sorry, I'm not familiar with either of those two products. Personally, I'd just use a scrub brush and some regular detergent from home. Rinse off, let it dry and apply the Dicor.

The object is to get the receiving surface clean and free of any dirt and grime so that the Dicor will adhere to it. If Greased Lightning or 409 do that and don't leave behind any film or residue that would prevent a good bond between the old sealant and the new Dicor, then you should be fine.

The alcohol mentioned in the previous post will work well too as a final cleaner.
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Old 05-20-2014, 04:50 PM   #7
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It's much better to ask a "dumb" question than to make a mistake and have to "undo what you did", so ask away and don't think it's a burden or foolish to ask.

As for cleaning the old sealant, start with a good inspection and remove all loose or damaged old sealant paying close attention to all the edges where it contacts the skylight and the EPDM roof membrane. Then, I use a mixture of Dawn dish detergent, hot water, a soft bristled brush and old fashioned "elbow grease" to get things clean, followed by a good rinse with clear water, let it dry in the sun and apply the DICOR self leveling sealant to the clean surface. Make sure you overlap the old sealant by at least 1/4" on all sides to assure a good, "new seal" over the entire surface.
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Old 05-20-2014, 05:12 PM   #8
therink
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The only problem I see with rinsing with water (say from a hose) is that more water may leak into the caulk. Because it is leaking, I would clean caulk real well using as little water as possible.
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Old 05-20-2014, 05:31 PM   #9
acampbell1999
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Quote:
Originally Posted by therink View Post
The only problem I see with rinsing with water (say from a hose) is that more water may leak into the caulk. Because it is leaking, I would clean caulk real well using as little water as possible.
Agreed. Thanks

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Old 05-21-2014, 04:36 AM   #10
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I have gone over the caulk seams on my trailer with Eternabond. Highly recommend it unless you love re caulking every year.
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Old 05-21-2014, 05:29 AM   #11
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The only issue with using Eternabond comes when the plastic skylight deteriorates from UV or is broken and starts leaking. Then the Eternabond on the plastic comes off with the old skylight, but the part adhered to the EPDM roofing membrane is "permanently attached. You will have to cut the Eternabond at the edge of the plastic. And the overlapping Eternabond won't come off the EPDM. Upon installation of a new skylight, you'll have to seal over the old tape. It isn't a big problem unless the flange on the new skylight is larger than the old on, then it won't lay flush with the EPDM, but will ride up on the old tape. The way things change shape and size in the RV industry, who knows whether the new parts will fit properly. Eternabond will adhere to itself, so it's not an issue of not being able to reseal the new skylight, it's getting the mounting flange to lay fat against the EPDM roof without riding up onto the Eternabond.
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Old 05-21-2014, 02:30 PM   #12
acampbell1999
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I picked up some dicor and put on there this afternoon. Time will tell if it is fixed. I also put some around the septic vent as well as it was cracking .

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