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2 other issues
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Posted by Snowmobile [Email] (#686) [Profile/Gallery] (more from Snowmobile) on Sat, 10 Jun 2017 06:07:52 Share Post by Email
In Reply to: Quality of application matters., Snowmobile [Profile/Gallery] , Sat, 10 Jun 2017 04:56:09
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First point:

Re application - do they remove the entire interior to Zeibart the car? Having gone through this on our c900 winter beater, the biggest source of rust on that car was the floors - rusted from inside out. No rust proofing on the floors. They are covered in a stack up of: metal, what looked like bitumous sound deadening, sponge, rubber (sponge/rubber was the underlay), carpet. So any moisture spilling on the floor that got around the rubber top layer of the underlay soaked into the sponge and got trapped between 2 vapour barriers (rubber, and metal floor). This found it's way to the metal through any coating defects (paint, sound proofing), and caused rust over 30 years of the car's life. Even if liquids are not spilled, snow does get in a car in winter and melts (becomes liquid). Also, moisture from humans in a warm car tries to escape and condenses as soon as it hits a cold surface. Sponge in the underlay acts as an insulator making the metal a cold surface, so water could condense at that layer and get trapped between the 2 vapour barriers... basically, when I removed the interior of that car, the underlays were completely saturated in water to the point of dripping, even though the car had sat for 3-4 months garaged through the summer months at that point (hadn't seen any moisture in that time)!

Second point:

In a c900, brake lines run through the interior of the car in the floor under the carpets. This is seemingly good for protecting the brake lines from corrosion and road related damage. However, brake lines do sometimes leak, and brake fluid eats paint. No paint = rust. Not only that, the lines run next to the drivers side doors, so get exposed to lots of moisture as occupants track snow into the car in winter. So a small amount of moisture causes the line to corrode, eventually leak, eat the paint, then cause catastrophic rust from the inside out.

Here is before photo - you can see the brake lines near the door, corrosion on the lines, rust following where it weeped down. I fixed this up once prior (the black POR15) when the original lines leaked and my saab tech replaced the brake lines, which are the ones pictured with corrosion starting already again. And the floor has several holes in it where it has rusted through from accumulated moisture. You could not see this from outside the car - the paint underneath was still completely intact, and the holes were holes through the metal - the saab paint was still covering the hole completely intact.



and after fibreglassing the floor with POR15 also (this held up very well):



You might think rubber floor mats are the solution to winter moisture being tracked in... they can help, but they also form a 3rd vapour barrier, thereby trapping any moisture that slips by them into the carpet layer... rubber floor mats don't cover all surfaces and moisture does get around them, and any that does is around all winter. Moisture on the mats melts and goes somewhere, possibly condensing in places like under carpets...

basically, it is a challenge to keep a clean, dry, rust free car in the north east! rust proofing is 1 step that helps, but there is no magic bullet.

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