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[email protected] clare@snyder.on.ca is offline
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Default Modern car paint and rust

On Tue, 21 Feb 2017 12:03:45 -0800 (PST), wrote:

On Thursday, February 16, 2017 at 8:42:27 AM UTC-5, Ignoramus20725 wrote:
On 2017-02-12,
wrote:

Right. It's better coatings, better primers and protection, and
better application. Read, water-based coatings that often are based
on urethanes; phosphate and weldable, etching primers; galvanizing
in rust-prone areas; and electrophoresis and electrostatic
application. The first water-based coatings -- used into the '80s by
some manufacturers -- had poor adhesion and didn't weather
well. They're MUCH better now.

All of this became more necessary as body panels got thinner, with
the use of AHSS (advanced high-strength steels; a continuing
evolution of the HSLA [high-strength, low-alloy] steels that were
first used in the '70s). Rust is potentially a bigger problem than
ever because the steel is thinner.


Ed, if I buy a modern car like a Honda, how long can I realistically
expect them to last?


Jeez, that's above my pay grade, Ig. There are just too many variables. I can tell you, though, that eight years is more or less the industry benchmark these days, and when you dig into their technical literature, you'll find that ten years is a frequent target for the latest treatments.

A lot of today's vehicles have a 10 year rust "perforation" warranty.
If you get a bubble in the paint you KNOW there is perforation
allowing moisture in from the back.