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Old 07-30-2015, 09:39 AM   #2199
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I wish that Airsteam would provide real data on what prevents filiform. The corrosionX/Boeshield followed by an organic coating appears to work but why not just perform standard filiform tests to determine what protocol would work best. Afterall, they seem to be the root cause for the problem because their production process does not prevent the exposed edges.
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Old 07-30-2015, 10:09 AM   #2200
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This was my point earlier. With the expense of these new models, there hasn't been some real corrosion testing in a real way to prevent it. A good clear coat after its put together could stop not? For a $125,000.00 Classic one would think that should not be an issue after shelling out that kind of money. I had am aluminum fishing boat in fresh water, no salt water, and had it for many years. Not one issue with corrosion inside or out. Make one wonder what they are using to cause this.
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Old 07-30-2015, 10:34 AM   #2201
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Question

......."Make one wonder what they are using to cause this."

If your referencing the Filiform corrosion.....it's the pre-coated Alcoa aluminum sheet that is compromised at every cut edge during the Airstream manufacturing process.

It's not a new concern, so I wouldn't hold your breath waiting for a response.


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Old 07-30-2015, 06:03 PM   #2202
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Quote:
Originally Posted by ROBERT CROSS View Post
......."Make one wonder what they are using to cause this."

If your referencing the Filiform corrosion.....it's the pre-coated Alcoa aluminum sheet that is compromised at every cut edge during the Airstream manufacturing process.

It's not a new concern, so I wouldn't hold your breath waiting for a response.


Bob
While the design of an AS may be timeless, manufacturing processes are not. Then when you change the material input so much, the manufacturing process certainly must change. I believe GM and Ford use to believe in the 60s to 90s that nothing needed to be done to their manufacturing practices. Then the new entries from other countries started to move quality forward. So lets say the trailer industry is at least 50 years behind the auto industry, we might hope for a new entry to appear soon that will have both style and quality.
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Old 07-30-2015, 08:45 PM   #2203
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I've been through the factory many times during many generations of build. Never once have I seen an Alcoa name on any sheet or coil of aluminum product on the premesis.
Not making any claims but I have always been doubtful!
Usually a materials manufacturer is plenty proud of their goods and has their name plastered all over!
The white film currently used has absolutely no marking whatsoever!
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Old 07-30-2015, 10:01 PM   #2204
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Years ago the vehicle manufacturers realized corrosion was a problem and they redesigned the way the coated and painted their vehicles. As a result...less rust and corrosion. AS on the other hand has not been listening to its customers about this issue and try to resolve it. As far as ALCOA supplying the materials to AS, it would not surprise me at all if these materials were shipped from China. Ever hear about Chinese drywall issues? Nightmare!!!! Millions of dollars of damage to homes across the country. Again, if an aluminum fishing boat does not have issues with filiform after years of being in and out of fresh water (rain as well in South Florida) why does an AS? They obviously know the areas where they appear are the cuts and rivet holes, why then did they not change something. Maybe Thor just is more concerned about quantity (money) than quality.
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Old 07-31-2015, 05:50 AM   #2205
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Quote:
Originally Posted by Slympicins View Post
Years ago the vehicle manufacturers realized corrosion was a problem and they redesigned the way the coated and painted their vehicles. As a result...less rust and corrosion. AS on the other hand has not been listening to its customers about this issue and try to resolve it. As far as ALCOA supplying the materials to AS, it would not surprise me at all if these materials were shipped from China. Ever hear about Chinese drywall issues? Nightmare!!!! Millions of dollars of damage to homes across the country. Again, if an aluminum fishing boat does not have issues with filiform after years of being in and out of fresh water (rain as well in South Florida) why does an AS? They obviously know the areas where they appear are the cuts and rivet holes, why then did they not change something. Maybe Thor just is more concerned about quantity (money) than quality.

.....your fishing boat is not coated aluminum.

.....if China is in PA, then yes, that's where the aluminum comes from.

Bob
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Old 07-31-2015, 06:13 AM   #2206
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It does, but see the quote below and the rest of Bob's link above about corrosion.

((Filiform corrosion is minimized by careful surface preparation prior to coating, by the use of coatings that are resistant to this form of corrosion (see above), and by careful inspection of coatings to insure that holidays, or holes, in the coating are minimized.))

Problem is that even though our Alcoa baked on clear coat stops oxidation and corrosion of the AL, it also provides a path for filiform if it is scratched, damaged or missing. That is why you follow owner and Johnson Ctr. ideas here to inspect your trailer regularly and stay ahead of the problem. In short, treat any small area found with corrosion x, then reseal with a touch up of clearcoat. I still also recommend a full touch up of all exposed aluminum panel edges with Clearcoat. (Especially important with a new trailer--edges and rivet holes are not coated since AS cutting, forming, and drilling are done after Alcoa clearcoating).
So clearcoat will adhere to areas that have just been treated with Corrosion X? Would applying clearcoat over areas of filiform element the need to apply Corrosion X later?
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Old 07-31-2015, 06:27 AM   #2207
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I would only apply clear coat to absolutely clean/dry aluminum. (remove all traces of the filiform tracks)
I use mineral spirits or 3m prep solvent.

IMHO.....A non-compromised clear application will not need treatment, I don't see a need to treat areas that I have re-coated.
Fact is, I have never used the Beo or the X.

Most filiform will appear in the first 5 years of of use, I have not had any real breakouts for quite awhile.


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Old 07-31-2015, 06:51 AM   #2208
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Years ago,many proposed a class-action suit for A/S denial of Filiform or spiderweb corrosion.Did that ever progress? My sheltered 07 Safari has webs all over and even the wheels.I suspect it is a coating issue,but,of all the posts I've read,no one seems certain.Could it be an electrolysis issue?Mine has webs around the rivets,seams,as well as any penetrations.I have not seen this type of corrosion on other types of aluminum trailers ,just A/S.
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Old 07-31-2015, 11:07 AM   #2209
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Quote:
Originally Posted by ROBERT CROSS View Post
I would only apply clear coat to absolutely clean/dry aluminum. (remove all traces of the filiform tracks)
I use mineral spirits or 3m prep solvent.

IMHO.....A non-compromised clear application will not need treatment, I don't see a need to treat areas that I have re-coated.
Fact is, I have never used the Beo or the X.

Most filiform will appear in the first 5 years of of use, I have not had any real breakouts for quite awhile.


Bob

This is where it gets confusing. I believe that some of the guidance from Airstream is to treat with corrosionX then the organic layer. I was trying that out on a couple pieces of their coated aluminum that I purchased and did not like the oily film and could not see the organic would either.

This is something that Alcoa would most likely have the best subject matter experts. I suspect that if you reached out to them, they would pass you to Airstream just as I am sure Airstream would push you off to Alcoa. I see that on another thread someone was given cleaning and care guidance from them (http://www.airforums.com/forums/f441...oat-18760.html)

I have used the pen from the Airstream store. It works fine but leaves a thick coating that I find to be unsightly. How do you apply the organic coating without it leaving a thick layer? Also, does mineral spirits leave a residue? Would iso. alcohol work better?

Pat
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Old 08-01-2015, 11:35 PM   #2210
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So clearcoat will adhere to areas that have just been treated with Corrosion X? Would applying clearcoat over areas of filiform element the need to apply Corrosion X later?

I just Answered this, but don't see the post. So forgive if it shows up twice. But the short story is: you can treat the filiform with corrosion X. Then wipe that off with a dry cotton cloth--no solvent. Then reseal the area with a polymer clear coat like Nyalic. It will adhere just fine to the surface despite what is probably a microscopic amount of corrosion x still there. I can not recommend an enamel, lacquer or acrylic clear coat over a residue like that, but the polymer seals and adheres fine.
I use a needle to scratch the filiform line first, then apply C X, wipe with dry cloth, then spray or small brush the Nyalic on. I have a number of 3 year old repairs like this. Filiform stopped and Nyalic coat looks as it did when applied. As to the question of just re-clearcoating without the corrosion x, all I know is that if you get even a microscopic amount of C X into the filiform and then seal it there, you are done with that problem area.


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Old 08-02-2015, 12:10 AM   #2211
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We began treating our Airstream shell rivets and edges regularly with CorrosionX, and the underbody steel with Boeshield T9 the day we brought it home new. There is no corrosion or rust anywhere on or under the Airstream approaching four years.

I will qualify this by saying we never tow it on winter salted roads or park it at the salt air environment of the coasts. If we did the result may be different, but most probably not nearly as severe as an untreated Airstream.
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Old 08-02-2015, 06:05 AM   #2212
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Specialized filiform removal tool

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