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Old 10-08-2014, 06:32 PM   #1
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What caulk for wall to cap joint?

Well, it's been a short summer, bought a boat at auction and spent my time getting it into shape as best as possible while in the water. Now back to work on my motorhome!

I sealed all penetrations on the roof, however, I believe the leak it had on each side which softened the floor in the rear corners of the bedroom were coming from that joint. Fortunately the floor has easy access so I took up a section on each side of the bed, even had a joint there so separation was easy. The coach has been in my barn now for almost a year, nice and dried out. Going to put her back together and then new carpet front to back.

I removed the joint cap as you can see from the picture. Old calk just crumbled out. I suspect it is that same stuff as the roof sealant. I cleaned it all up, now ready to re-bed the cap and the fasteners. Thinking of either a polysulfide or silicon, any recommendations?
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Old 10-08-2014, 08:29 PM   #2
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I like Geocel Proflex RV for that sort of thing. It's a tri-polymer type. My other favorite for most any joint is 3M Body Seam Seal.

Good old Dicor works too (the regular formula, not the self-leveling).
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Old 10-08-2014, 08:39 PM   #3
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Thank you Gary, I am totally unfamiliar with motorhome sealants so was speaking marine environment again.
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Old 10-09-2014, 10:21 AM   #4
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LOL. 3M Marine Sealer 5200 works great on darn near anything, including your RV!
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Old 10-09-2014, 07:13 PM   #5
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Quote:
Originally Posted by Gary RVRoamer View Post
LOL. 3M Marine Sealer 5200 works great on darn near anything, including your RV!
You know I have some of that LOL! Was a bit reluctant due to its tendency to run.
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Old 10-10-2014, 06:14 PM   #6
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No silicone!!! 5200 is almost impossible to remove if you need to. 3 marine UV 4000 is very strong, easier to remove and more elastic than 5200. Stay away from silicone.
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Old 10-10-2014, 06:58 PM   #7
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ChasA, 3M 5200 a polyurethane seal, is that what makes it hard to remove?
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Old 10-10-2014, 09:36 PM   #8
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Seems to be a common thread, nobody likes silicon for this job. Any particular reason why?
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Old 10-10-2014, 09:43 PM   #9
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It breaks down rapidly, poor adhesion, can't paint if needed, will mold, etc., etc. FWIW there is a readily available solvent that will break down 3 M 5200 with a bit of elbow grease. I've used 5200 for over thirty years. You can use mineral spirits for clean up or to blend into a perfect caulk line.
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Old 10-10-2014, 10:13 PM   #10
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Why do most rv manufacturers use silicone?..cheaper?
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Old 10-11-2014, 10:43 AM   #11
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I don't have an issue with cost, I want the stuff that will do the job in there ie seal the overlapping joint and properly bed the screws in a moving unit. Quite similar to a boat, that is why I was thinking of polysulfide given its ability to stay "soft" allowing screws to be snugged etc without breaking the seal. The other products mentioned, I am unfamiliar with, however, I will check them out next week at an RV store.
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