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Old 10-04-2013, 02:51 PM   #1
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Time to fix the PO's sorry roof sealant job!

Sooooo finally getting around to actually doing this, and afraid I may be a little late...

it appears there has been three "repair/fixes" for the leaking roof on my 85 avion; the main seam from front to rear especially so. I have removed much of the coats of sealant. In order they seem to be an epoxy sealant, black house roofing tar, and then a white 6 inch wide swath of crap (in my opinion lazy and a complete waste of time). The latter of the bunch covers every seam on the roof as you will see in the pics. some pieces of the sealant came off in long chunks, from directly over the seam. I believe my leak (mainly) is coming from under the antenna base, where all the sealant pulled up by hand with no scraping, and will subsequently be removed because of this. I don't use it and can see no reason to keep it up there, as there are many portable options. plus it'll clean up the roof lines!

So for all you DIYers out there, what is the best roof sealant? I'm thinking of using an aircraft grade sealant for all the main seams, two part type that sets up in about an hour or so. Main issue is the worst part that I have found runs under the A/C unit on top. How hard is it to remove the A/C unit to seal correctly, so this is the last time I have to do this? Thanks for the replies! oh and thats my four legged helper!
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Old 10-04-2013, 03:09 PM   #2
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SikaFlex 221 in grey.
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Old 10-04-2013, 03:10 PM   #3
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Red face WOW...quite a project!!

IMHO....I would not use any sealant that involves a "hardener". That sez to me it's polyester or epoxy based....and it's hard. Not so good on a flexable roof.

I would stick with a polyurethane based sealant.

I've had good luck with these.

The Acryl-r is used for narrow gap seams

Bob
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Old 10-04-2013, 03:21 PM   #4
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By Aircraft sealer are you refering to the polymers like PRC or PRO Seal with an Mil 8802 spec or are you refering to the two part silicons. The 8802's like PR 1440 is what I use. I would not use the silicons. It also looks like you are dealing with a fair amount of corrosion, that should be cleaned up before any sealing can be done. I can't comment on the air conditioner because I have no idea how it's mounted but it looks to me like it will have to come off to be done correctly, ditch the TV antenna, and cable pass thru and patch up using the 8802 and a piece of aluminum.
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Old 10-04-2013, 03:24 PM   #5
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any issues with the anodized finish on the Avions and using any of the above products? I didn't see any on the product websites, but why would they disclose that...thanks for the replies!
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Old 10-04-2013, 03:27 PM   #6
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AEROWOOD- yes something like the PRO seal you are referring to-didn't have the nomenclature for the civil side locked down yet! thanks!
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Old 10-04-2013, 04:14 PM   #7
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Quote:
Originally Posted by blackhawksid View Post
Sooooo finally getting around to actually doing this, and afraid I may be a little late...

it appears there has been three "repair/fixes" for the leaking roof on my 85 avion; the main seam from front to rear especially so. I have removed much of the coats of sealant. In order they seem to be an epoxy sealant, black house roofing tar, and then a white 6 inch wide swath of crap (in my opinion lazy and a complete waste of time). The latter of the bunch covers every seam on the roof as you will see in the pics. some pieces of the sealant came off in long chunks, from directly over the seam.
Use a heat gun to remove the remaining sealant being careful not to set anything on fire. Solvent will remove the remaining residue.


Quote:
I believe my leak (mainly) is coming from under the antenna base, where all the sealant pulled up by hand with no scraping, and will subsequently be removed because of this. I don't use it and can see no reason to keep it up there, as there are many portable options. plus it'll clean up the roof lines!
Your choice but the roof antenna will work much better than anything else. Vintage ones are sought after, so sell it rather than throwing it away.


Quote:
So for all you DIYers out there, what is the best roof sealant? I'm thinking of using an aircraft grade sealant for all the main seams, two part type that sets up in about an hour or so.
While that's probably an excellent product, the one part Trempro/Vulkem/Sikaflex products widely recommended on airforums will work just as well in this application and are cheaper, more readily available, and easier to apply.

Quote:
Main issue is the worst part that I have found runs under the A/C unit on top. How hard is it to remove the A/C unit to seal correctly, so this is the last time I have to do this?
A/C is probably held on with about 40 rivets and there are probably copper refrigeration lines running between it and the evaporator which is inside. I would imagine that you're better off sealing around the outside unless it is clear that is insufficient. Otherwise you'll have to drill out all the rivets, shim the A/C up an inch or so, work the sealant in between, lower the A/C, install new rivets.
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Old 10-04-2013, 05:49 PM   #8
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AEROWOOD- yes something like the PRO seal you are referring to-didn't have the nomenclature for the civil side locked down yet! thanks!
I have used aircraft sealant on my entire project below except for the fantastic fan because I had never used it on PVC. Best sealant in the world if you can get your hands on it. I use the expired stuff on my Airstream because it is illegal to use it on the airplanes after the shelf life has expired.
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Old 10-06-2013, 01:52 PM   #9
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expired is what i was looking to use. still good in my book!
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Old 10-06-2013, 04:29 PM   #10
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Where do you get this Aircraft sealer and how much does it cost? What is it called?

Perry
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