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Old 04-19-2014, 11:22 PM   #1
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Aiming for dry: TremPro, Parbond, Elastomeric…Help :)

Hello good folks~

Needing some advice on what sealant to use in various places as I renovate my first ever Airstream, an 81 Excella II which has plenty-o-leaks (though the seller said there were none, ha ha). I've read/heard various suggestions and honestly I'm confused.

I understand I need to remove old sealant first, not to use silicone, and that taping will help with a clean line. I saw that Vulkem is best for the roof and over the tops of the windows and doors and Parbond is good for seams and sides of windows. Then someone who repairs Airstreams for a living shared they use Trempro for everything (looks like that's the new version of Vulkem). And someone else I talked to swears by Elastomeric.

I don't want to mess up with such a big job and appreciate your support. What would you recommend for the following locations:
-around roof vents
-over windows and doors
-along seams on side
-around lights
-at the bumper (where a lot of water is moving in)
-any other key locations I'm missing...

Thanks tremendously!
Kim
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Old 04-20-2014, 02:00 AM   #2
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Kim,
There must be quite a few threads on sealants here on the forum.
However I would remove all of the old sealants from all seams with a plastic scraper or a piece of cow hoof you can get from the pet store, it will not scratch the aluminum.
Then reseal every seam and rivet head with Capt. Tolley's Creeping Crack Cure, It will wick into the seam like no other product I know of and dry's clear. It is the best for fine seams and rivet heads because of its wicking action.
After you have sealed every seam and rivet head with Capt. Tolley's then reseal the large gaps with Trempro 626 and Parbond on the rest of the smaller seams.
Trempro is gray, Parbond is silver/aluminum.

My 2 cents
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Old 04-20-2014, 07:28 AM   #3
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What Batman said. Except I use Tempro 635 on the large seams. Eyebrows, gutters, etc. Capt. Tolleys is great stuff. For the roof openings, I went with Eternabond tape last time instead of sealer. Still use the Tempro on the TV antenna, Radio Antenna, and bath fan and tank vent.

I found quite a few rivet leaks with Tolleys this spring. I use Parbond on seams with 1/16" or less gap and Tempro on anything larger.

Take the time to tape everything off with painters tape for a professional looking job. Definitely worth the effort.
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Old 04-20-2014, 09:15 AM   #4
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Trempro 644 is the one to use I think.
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Old 04-20-2014, 09:42 AM   #5
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I've switched over to only using Tempro. It sticks like crazy and stays flexible. In my experience, Parbond makes a nice line, flows well but after a year or so, cracks and leaks.

On the really small joints, I tape each side and work in the tempro. For removable items like clearance lights, I tape around them, remove the light and put tempro on it's base. reinstall and clean up the mess (thats where the tape really helps!!!)

After several years on a couple of trailers it has worked very well for me.
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Old 04-20-2014, 09:59 AM   #6
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The last post in this thread has a list of sealants:

http://www.airforums.com/forums/f44/...ry-116214.html
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Old 04-20-2014, 11:47 AM   #7
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Quote:
Originally Posted by hihoagrv View Post
i've switched over to only using tempro. It sticks like crazy and stays flexible. In my experience, parbond makes a nice line, flows well but after a year or so, cracks and leaks.

On the really small joints, i tape each side and work in the tempro. For removable items like clearance lights, i tape around them, remove the light and put tempro on it's base. Reinstall and clean up the mess (thats where the tape really helps!!!)

after several years on a couple of trailers it has worked very well for me.
x2.
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Old 04-20-2014, 12:19 PM   #8
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I'm not familiar with Tempro, but I've had excellent results with EternaBond for roof vents. I bought two rolls of th 5" wide, it's been on for 2 years, not a problem.
Larry
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Old 04-20-2014, 12:30 PM   #9
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Hmmm, except where there is moderate movement between surfaces (like battery opening frames to skin) I've noted Parbond outlasting Tempro by 2 times, roughly.

Perhaps climate??????
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Old 04-20-2014, 01:58 PM   #10
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Quote:
Originally Posted by simple sanctuary View Post
Hello good folks~

Needing some advice on what sealant to use in various places as I renovate my first ever Airstream, an 81 Excella II which has plenty-o-leaks (though the seller said there were none, ha ha). I've read/heard various suggestions and honestly I'm confused.

I understand I need to remove old sealant first, not to use silicone, and that taping will help with a clean line. I saw that Vulkem is best for the roof and over the tops of the windows and doors and Parbond is good for seams and sides of windows. Then someone who repairs Airstreams for a living shared they use Trempro for everything (looks like that's the new version of Vulkem). And someone else I talked to swears by Elastomeric.

I don't want to mess up with such a big job and appreciate your support. What would you recommend for the following locations:
-around roof vents
-over windows and doors
-along seams on side
-around lights
-at the bumper (where a lot of water is moving in)
-any other key locations I'm missing...

Thanks tremendously!
Kim
You can use Vulkem, Sikoflex or Parbond.

Vulkem is heavy duty, slow dry.

Sikoflex is heavy duty, fast dry.

Parbond is light duty, basically for small seams, and moderate drying time.

Andy
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Old 04-20-2014, 02:38 PM   #11
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I think Parbond is useless. Maybe it is climate, but I agree with HiHo about Parbond. I have used and tried every sealant I can get my hands on and have narrowed my use to two 3M products; 540 gray and 5200 white.
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Old 04-20-2014, 03:39 PM   #12
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Let me be clear relative to my use of Parbond. I ONLY use it for seams between skin and mounted items....like water inlet doors, Running lights, Electrical inlet, etc. Basically where I have a solid accessory to skin, very thin sealing seam. I don't use it for lower rub molding, gutters/awning rails, etc. where there are wider gaps subject to relative motion between panels. It is basically used for visible seams on the vertical panels which was originally sealed with Acryl-R. I think Parbond color looks better. However, I would never use parbond nor Vulkem on panel edge seals...only Acryl-R.
For those applications, I find Parbond excellent.
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Old 04-20-2014, 11:58 PM   #13
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Wow, thanks everybody! I guess in the end, I won't know (let alone, form a strong opinion) until I try.

Traveling to Out of Door Mart tomorrow (about a 75-minute drive without my trailer--I don't have a tow vehicle anyway) to get some supplies and will try to pick the service folks' brain. Also hope to get tips on which seams really need sealing (wish there was a diagram somewhere which highlighted them)…like, do the vertical seams really need to be caulked? And, if I'm not missing any rivets, do I need to seal over them?

Sounds like Trempro 635 might be a good bet for the bumper (not a particularly big gap there but it is a vulnerable and actively leaking area).

Had not heard of "eyebrows" (area over the windows?) nor rub rails (maybe same as "belly band"?)…thanks for ever an expanding Airstream vocabulary.
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Old 04-21-2014, 07:25 AM   #14
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Out of Doors Mart is very friendly and helpful. They will help you out.
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