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Old 04-16-2018, 04:04 AM   #1
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What type of sealant

Morning all, I want to reseal around the air horn and antenna mounts on my motorhome. It appears that what is on there now is a clear silicone sealant. Any recommendations. Motorhome is a 2003 Monaco Windsor. Any input would be appreciated.
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Old 04-16-2018, 05:06 AM   #2
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I'd use Dicor Self-Leveling Lap Sealant.
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Old 04-16-2018, 05:18 AM   #3
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Why are you resealing? If you have a leak I would recommend trying to remove what ever is there now, down to a relatively smooth surface, and then use the dicor. If it is still well attached, not trying to come loose and not leaking I would leave it alone.
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Old 04-16-2018, 09:37 AM   #4
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If it's a silicone sealant on there now you will have to somehow remove all of it and clean the roof thoroughly with Acetone or something similar before applying a regular roofing caulk. Nothing will stick to that silicone!

I would recommend the Dicor 502LSW self-leveling sealant!
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Old 04-16-2018, 10:23 AM   #5
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Lots of good advice.

I just finished touching up a few questionable spots on the MH roof with Dicor. After looking at the various gallon cans of solvents in the garage, I chose "wax and grease remover". I always use it before painting anything significant. I figured if it would clean a surface well enough for paint to stick it should be good enough to clean for Dicor. It seemed to work well.

I put some of it in a zip lock storage bag along with a couple of wash clothes I filched from the closet before climbing onto the MH roof. I was careful not to let the DW see me getting the wash clothes as that could have destroyed the whole plan. :-))

That also worked well, for the short term. I left it in the bag overnight and the next day there seemed to be a bit of leakage.

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Old 04-16-2018, 08:26 PM   #6
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Tremco 116 Vulkem Polyurethane High-Performance Sealant ..... Available from Lowe’s for about $5-$6 tube ..... Don’t believe you’ll find better - more workable sealant - We used on many leak repairs, wall / window details, etc over the years ..... comes in variety of colors and will hold paint, unless there is extreme stress and paint will crack from movement but NOT SEALANT .....

Available in a few colors and from amazon if you like


https://www.amazon.com/Tremco-Vulkem...mco+116+vulkem
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Old 04-16-2018, 08:28 PM   #7
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Quote:
Originally Posted by MSHappyCampers View Post
If it's a silicone sealant on there now you will have to somehow remove all of it and clean the roof thoroughly with Acetone or something similar before applying a regular roofing caulk. Nothing will stick to that silicone!

I would recommend the Dicor 502LSW self-leveling sealant!
You are right ...... Silicone won’t even stick to itself!
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Old 04-16-2018, 08:29 PM   #8
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Quote:
Originally Posted by JPeterson View Post
I'd use Dicor Self-Leveling Lap Sealant.


Another vote for Dicor.
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Old 04-16-2018, 08:37 PM   #9
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What type of sealant

The best way I have found to remove old silicone is to scrape as much off as possible with plastic razor blades, then use McKanica Silicone Remover to get the last remnants off.

https://scraperite.com/

SILICONE CAULK RMVR 3OZ by MCKANICA MfrPartNo 0354 https://www.amazon.com/dp/B000PVT1P4..._t2v1AbSA2S815
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Old 04-17-2018, 06:35 AM   #10
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Wax remover for paint prep won't work well on silicone.
Most body shops prohibit having ANYTHING silicone on premises.
On oyr boat I've scraped and cleaned w acetone until I thought it was gone then used fine wet/dry sand paper and was surprised at how much more came off.

Some swear by silicone...
Others swear AT it!
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Old 04-17-2018, 11:03 AM   #11
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I like 3M 4200 from back in my boating days. If it works for marine use it is good for the RV.
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Old 04-17-2018, 11:16 AM   #12
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Sorry for my misunderstanding. I used the wax and grease remover to clean the old Dicor before applying new Dicor. It worked well for that. I haven't used silicone on a camper for many years. Winemaker2 and others are correct about the silicone.

Steve
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