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Old 10-11-2015, 12:48 PM   #2255
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Filiform corrosion - updated

For the past 8 years, I have kept filiform corrosion under control by using Boeshield T-9, along with quality wash & wax products from Meguiar's.

The recent photo of my iconic "Dragon" filiform (seen below) shows that it has not advanced from its first photo seen in Post #399 (6/6/08) of this thread.

See more photos and details... and how I do my annual wash and wax (step by step) in my updated History Safari Express post, "Wash, wax and treat II".
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Old 10-11-2015, 08:56 PM   #2256
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SilverGate, your original posts on filiform treatment and prevention were perhaps the most important we have read to maintaining the appearance of our new 2012 Airstream.

Based on your reports, the first thing we did when we brought the trailer home was treat it for corrosion, all exposed raw metal on the shell, fixtures such as light bezels and hinges, and underbody steel. We have used different products, CorrosionX on the shell and Boeshield T9 underneath, but it's the ongoing regular treatment that matters.

The result of this and avoiding corrosive environments such as winter road salt and ocean salt air has been a totally corrosion-free Airstream after four years outdoors and extensive travel through the country. Thank you for this and the updates.
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Old 10-18-2015, 09:27 AM   #2257
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I am trying to remedy some of filiform corrosion issues. As I am inthe UK with a 2008 trailer getting locally sourced material is not always the easiest. I have got Corrosion X but am wondering what clear acrylic coating to then put on top...also the finish. Would VHT be a good solution?
By the way, with the rear light surrounds, screwing them inplace with iron/steel screws is almost guarranteed to create corrosion. I am on the hunt for aluminium screws!!
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Old 10-18-2015, 09:56 AM   #2258
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Just a thought: would stainless steel screws do the trick? They are pretty easy to get, though they cost a little bit more than standard steel or galvanized ones.
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Old 10-18-2015, 10:45 AM   #2259
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Huh!? Where are you going to put screws? Did I miss something?
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Old 10-18-2015, 01:37 PM   #2260
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Corrosion (?) on running light housing

My 2016 FC25 FB Twins is less than 4 months old and is developing what looks like corrosion on all the housings on the marker lights. It is brown in colour, blotchy without uniform shape and sort of looks like freckles one might see on a person's face. It's on the flat surfaces and along the edge where the housing turns 90 degrees towards the lens cap. It's not staining. See pic. It's unlike filiform corrosion in appearance (no filiform on my unit that I can see). It's on nearly all of my running light housings. Has anyone seen this, what is it, and what's the fix?
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Old 10-18-2015, 09:06 PM   #2261
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Quote:
Originally Posted by Rocinante View Post
Just a thought: would stainless steel screws do the trick? They are pretty easy to get, though they cost a little bit more than standard steel or galvanized ones.
First Google: will stainless steel screws corrode aluminum
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Old 10-18-2015, 09:27 PM   #2262
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Ok, so that would be a "No." Looks like galvanized steel would probably be better than SS because of the zinc coating, and aluminum would better still. Live & learn.
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Old 10-19-2015, 11:32 AM   #2263
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Corrosion problems with new Airstreams

Hmm two firms in our area that specialize in fasteners say they haven't been able to get aluminum screws for years, and that they only have zinc-plated or SS. No galvanized screws either, though those would have a thicker zinc coating.

Maybe you'll have better luck than us. If you find some, please share a link.
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Old 10-19-2015, 11:43 AM   #2264
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Originally Posted by gnijman View Post
My 2016 FC25 FB Twins is less than 4 months old and is developing what looks like corrosion on all the housings on the marker lights. It is brown in colour, blotchy without uniform shape and sort of looks like freckles one might see on a person's face. It's on the flat surfaces and along the edge where the housing turns 90 degrees towards the lens cap. It's not staining. See pic. It's unlike filiform corrosion in appearance (no filiform on my unit that I can see). It's on nearly all of my running light housings. Has anyone seen this, what is it, and what's the fix?
Looks like Rust to me. My marker lights mounting rings are completely brown from this rust. Watch the license plate light holder go that way too. Chrome rusts. Have been looking for replacements (probably easier than waxing continually) preferably in a hard plastic or rubber composition...
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Old 10-19-2015, 07:34 PM   #2265
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Don't use steel screws with zink or galvanizing. Stainless will work just fine in the AL. Dip the screw first in "Never seize" or a loctite /C5 A copper.


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Old 10-19-2015, 07:36 PM   #2266
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Those running light rings have ways been made of plastic. Unless something changed in 2016, it's not going to be rust.


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Old 10-20-2015, 05:38 AM   #2267
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Those running light rings have ways been made of plastic. Unless something changed in 2016, it's not going to be rust.


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So Howard, What do you think is happening here. Mine have no chrome-like appearance at all anymore. They darkened to the point that I don't see any shine just dull, almost black. Not that noticeable. Is it a chrome like paint that is pealing? Or is it in fact rusting through to the plastic? Would it be possible to sand lightly and use a chrome like spray paint?

I haven't ever taken one apart and had considered replacing mine, but I haven't found the rings themselves.

I have taken apart the rear taillight assemblies which are Chrome surrounds mounted to the Aluminum base (the latter was fraught with filliform BTW). And the chrome there is pitted with rust, very similar to the photo above, just further advanced. Looking to replace those as well.
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Old 10-20-2015, 07:40 AM   #2268
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On a 2016, the bubbling of the plastic appears to be a factory defect and I would think AS would replace these.

This should not happen unless there was an unusual exposure to an environmental hazard.

Just my opinion....
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