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Old 09-12-2011, 04:39 PM   #15
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Why vulkem? Well, the reason I use it is someone suggested it and I tried some. Works great. I spent too many years trying to seal aluminum on lumber dry kilns. RTV just does not seem to cut it after a few years. Vulkem (Parabond...) sticks like crazy and can be cleaned up a little with mineral spirits. Much easier and longer lasting than RTV.
Good stuff, nah.........real good stuff, and very long lasting as well.

Andy
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Old 09-12-2011, 05:18 PM   #16
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For me, it's wife, dog, Bess, good friends, food, drink and parbond and vulkem.
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Old 09-12-2011, 05:34 PM   #17
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This is what silicone will do over time. Someone had grossly oversealed our old TV antennae with silicone. When we removed the antennae, we had to add aluminum to the roof to strengthen it because the aluminum had been eaten away to the point of paper thinness.

Kay
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Old 09-12-2011, 06:23 PM   #18
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Just a few things to correct somethings not said 100% correctly.

Vulkem was a sealant. It was bought by TremPro and rolled into their very long list of sealants. Vulkem was originally designed to be used in expansion joints in concrete and masonry gaps in commercial buildings, however it works VERY WELL in Airstream construction. "Vulkem" is slowly being phased out by TremPro as it has brand recognition that is not "TremPro". Depending on when your tube was made, it might say "Vulkem 626" on it. It might also say "Trempro/ Vulkem 626" on it. The freshest batch will say "Trempro 626" on it nowhere does it say "Vulkem" . They all say "General Purpose Textured Polyurethane Sealant" on the tube. There are many codes for TremPro products 636, 635, the list is massive if you go to their website and look(or verify what I am saying is true. I know it is, for I have had the East Coast TremPro guy at my shop a few times now) Plain and simple Vulkem is #626 Trempro and all the other TremPro numbers are something else. I know nothing about any of those other TremPro products, because I use only 626 in my shop. NOTHING works as well as it does. Why mess with success?

Sikaflex is another product line that directly competes to fill this industrial need. Airstream uses Sikaflex and has for a number of years now. If you go to the factory you will see pallets of the stuff all over the place. They use it throughout the line, but it is most heavily used in vain in the rain tunnel to try and seal the leaks that should have been eliminated in construction.

The evils of silicon and aluminum were already covered very well.
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Old 09-12-2011, 06:28 PM   #19
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Good stuff, nah.........real good stuff, and very long lasting as well.

Andy
I second that. Today we tore apart the rear of a 71 Overlander. The VULKEM between the seams were still sticky to my touch. 40 years and it still is supple.
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Old 09-12-2011, 07:06 PM   #20
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Ok guys I will use the Vulkem.

Thanks

Perry
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Old 09-12-2011, 07:11 PM   #21
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Ok guys I will use the Vulkem.

Thanks

Perry
And only one of us is a REP, that says a lot for a product!
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Old 09-12-2011, 07:27 PM   #22
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Furthermore, Vulkem is running a close second, to duct tape.

Andy
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Old 09-12-2011, 07:33 PM   #23
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Well I just want to do it right. Trying to find marine plywood at a decent price. I have had quotes of $40-$90 for a 1/2" 4x8 sheet.

Perry
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Old 09-12-2011, 07:54 PM   #24
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Well I just want to do it right.

Perry
If you haven't already, you might want to read the thread for nylaboard. Pay particular attention to posts by Boatdoc that detail his critique of nylaboard (expansion at extreme temp ranges) and his alternate method of using sign board (aluminum clad ply) for full floor replacement. Early on (2008) the were several that indicated they were doing full subfloor replacement with nylaboard, but I haven't found the threads indicating how they've performed several years later.
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Old 09-12-2011, 08:20 PM   #25
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They all say "General Purpose Textured Polyurethane Sealant" on the tube.
I believe that the key is polyurethane. That is the base most of the construction adhesives that I see at Lowes. Marine sealants as well. It seems to me that the polyurethane makes it an adhesive + sealant.
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Old 09-12-2011, 08:45 PM   #26
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I think I am going with standard marine plywood. The problem was the rear seal in the bumper area going bad. It the floor had been something that would not rot, corrosion would have eventually killed the trailer.

Perry

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If you haven't already, you might want to read the thread for nylaboard. Pay particular attention to posts by Boatdoc that detail his critique of nylaboard (expansion at extreme temp ranges) and his alternate method of using sign board (aluminum clad ply) for full floor replacement. Early on (2008) the were several that indicated they were doing full subfloor replacement with nylaboard, but I haven't found the threads indicating how they've performed several years later.
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Old 09-12-2011, 09:11 PM   #27
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I think I am going with standard marine plywood. The problem was the rear seal in the bumper area going bad. It the floor had been something that would not rot, corrosion would have eventually killed the trailer.

Perry
The rear bumper area in '70s Airstreams (and likely later as well) was a giant design defect. Once that is fixed, marine ply will have adequate rot resistance.

House roofs aren't built w/ marine ply, but last for a long, long time if the water is kept off. Wood will not survive long term wetting w/ fresh water... and our trailer shells & frames won't handle salt water .

- Bart
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Old 09-12-2011, 09:34 PM   #28
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Perry.

What Airstream uses is Vulkem for the large seams, and Parbond for the small seams.


Andy

Andy,

Any idea when AS stopped using Vulkem/Parbond and why?

We have a 2005, bought used about three years ago. At that time, we visited Jackson Centre and took teh factory tour. On teh tour, we asked and were told that AS would have used Sikaflex for larger joints and Acry-R for thin seams at the time our trailer was built,

As well, (as we were shown) that was what they were still using on new trailers in 2008. Not sure about 201i, although we were again in Jackson centre in Feb 2011, and Sikaflex / Acryl-R were still the products being sold in their store.

Is there much difference between these two sets of products in your view?

Is there compatibility between the two sets of products? If not, perhaps Vulkem/Parrbond should be used on older model trailers?

Based on the factory recommendation , we bought Sifaflex/Acryl-R and have been using that to maintain our trailer so far.

Appreciate any comment/ advice.

Brian M.
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