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Old 08-06-2010, 10:53 AM   #1
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Silicone / No Silicone for Fantastic fan

I just today ordered 2 fantastic fans from Vintage Trailer. I went yesterday to Fastenall and found a TremPro product, no silicone, to seal the fan. Today while speaking with the people from VT he insisted that you need to use the recommended procedures and recommended sealant. The one they use is a silicone type. He said that only a silicone sealant will adhere to the plastic housing and if you don't other sealers will crack and allow water in.

Many of you in Airstream Land have installed the fantastic fans. What sealant have you all been using ?????? He also said that if you follow the directions from Fantastic you will be using very little sealant to do the job.

Thanks all,
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Old 08-06-2010, 11:30 AM   #2
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Pure Silicone - NOT!

I looked at the FAQ pictures from Fantastic Fan that illustrated a new install. Even though the caulking picture refers to the sealant as "silicone", the tube being used is a DAP product.
DAP has two exterior products suitable for caulking/adhesion: 1) Alex Plus, which is an acrylic latex caulk plus silicone and 2) Dynaflex 230, which is a latex product.
As many on the forums will attest, pure silicone is NOT a good caulk nor is it a good product to prevent water from entering the coach. When applied as a caulk, pure silicone tends to have air pockets, which eventually allows the ingress of water.
Pure silicone is great for certain applications, not sealing or bonding anything on the exterior of an RV!
We have used the Dynaflex 230 product and have found it satisfactory for exterior jobs. It does remain flexible over time, an important factor for a moving RV.
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Old 08-06-2010, 11:39 AM   #3
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I used Vulkem to seal my fans on my '72 Sovereign and will use Vulkem to seal the fantastic fan on my '58 Overlander.
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Old 08-06-2010, 01:03 PM   #4
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hi Roger,

do use the FV foam gasket! when you position it under the flange, try to keep it under the flange; else trim it flush before caulking.

NO silicone caulking anywhere on your aluminum Airstream, please! it might be fine for a plastic SOB, but not on your Excella.

instead, Sikaflex 721 is an excellent product, and is most easily available at the "Mother Ship" store in JC, or, maybe even your local dealer.

check the date on the tube; you'd like it to be less than one year old.


these threads may also be helpful to you -

http://www.airforums.com/forums/f455...all-65731.html

http://www.airforums.com/forums/f456...oof-64298.html


best,

(and also in NJ.... )
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Old 08-06-2010, 01:32 PM   #5
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I'll be the contrarian here as I used grey silicone on mine. Followed the VTS recommendation and also from a Colin Hyde discussion on the Vap. Didn't use the foam gasket and went with pan head screws and flat washers instead of countersunk.

Not sure there's a right answer on this one as you're likely half wrong either way you do it.

cheers,
steve
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Old 08-06-2010, 01:55 PM   #6
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I have used silicone on my Tradewind and had leaks within 12 months everywhere I used it. I then used Vulkem and have never had any leaks develop on metal-metal and metal-plastic bonds.

I used olympics to hold down the fan flange, and I did not use the supplied gasket. I got the tightest fit, and much less vibration passing through to the shell than with the foam gasket in place.
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Old 08-06-2010, 02:38 PM   #7
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My sealer of choice for anything on the Airstream is Pro-Seal, a two part polysulfide sealant used in the aviation industry. It sticks to anything, cures to a medium-hard rubber consistency, and is impervious to almost anything. A little pricey for a 3 1/2 ounce tube at $18.00, but as my dad always said: "It only cost a few cents more to go first class". It can be found at Aircraft Spruce, and has to be shot with a sealant gun.
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Old 08-06-2010, 03:24 PM   #8
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I have used the Trempro 635 sealant on 3 fans and never had a leak. I used a putty knife to spread it all along the frame of the fans onto the roof of the AS, similar to what the factory had done.
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Old 08-06-2010, 05:40 PM   #9
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If you check out our Little Girl Refurb thread, you can see first hand what pure silicone will do to aluminum over time. I'm sure that tv antenna was up there for awhile, but it ate the aluminum down to a very very thin veneer. I would definitely go with something that is not silicone!

Kay
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Old 08-06-2010, 06:23 PM   #10
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I recently sealed the interior seams and rivets of my Ambassador with Seamermate (HD $4.99).I spoke with the techs at Amerimax the parent company and this is a non silicone ,self leveling,aluminum gutter seam sealer.It appears to look and has the characteristics of Parbond.Dries to the same type of look.I sealed my restored tailight housings today and will probably use on seams.I have used under all olympic rivets and sprayed water with no leaks.I also checked out member Bob Thompson's posts on this stuff from 6 yrs. ago.I pm'ed him and he said no leaks in 6 years,great product!It applies and stays silver.Just an additional product to confuse you,but easy to find.
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Old 08-07-2010, 12:39 PM   #11
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Quote:
Originally Posted by bwaysteve View Post
I recently sealed the interior seams and rivets of my Ambassador with Seamermate (HD $4.99)..
Why seal interior? Do ya have some wild parties? What color Seamermate? I'd need blue to match my drapes.
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Old 08-07-2010, 12:43 PM   #12
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Sealed interior since I was down to bare shell.I was able to see old leaks and corrosion that I cleaned up.Insurance seal inside.I think it only comes in silver.No parties yet,need a couch and a refer!
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Old 08-07-2010, 04:47 PM   #13
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Hey a couple of folding chairs and a cooler. Life is good. What more do you need ???????

WHY WAIT !!!!!
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Old 08-07-2010, 05:00 PM   #14
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I used trempro 635, no foam gasket. Trempro is a great product both on aluminum and plastic. http://www.tremcosealants.com/indust...tail.asp?id=33
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