Oh, I got rid of the rust. It can trap moisture and oxygen in it's pores
that make problems for the paint, which can in turn allow addtional oxygen
in for further rust. On my Chevy, I've just brushed off the rust and used a
good helping of touch up paint to cover it. After 4 years, no addtional rust
has formed. Why? Because although the rust is still there, it has no
external source of oxygen.
The bulging in the paint is caused by rust forming (or continuing to form)
from trapped oxygen, or by trapped moisture heating and cooling. If the
paint bubble doesn't burst, eventually rusting stops as the trapped oxygen
is used up. Rust *must* have an external source of oxygen and can't use the
oxygen bound up in existing rust (iron oxide).
George Richardson
'57 TR3, TS15559L
(getting ready to paint - and now on the web!)
http://www.merlingroupinc.com/tr3.htm
-----Original Message-----
From: Joe Curry <spitlist@gte.net>
To: George P. Richardson <gprtech@frontiernet.net>
Cc: Triumphs Mail List <triumphs@autox.team.net>
Date: Friday, February 13, 1998 12:53 AM
Subject: Re: [Fwd: Rust elimination]
>George,
>If you did not get rid of the rust on your valuable TR3, and expect that
>painting over it will seal it and thus prevent further rusting, I pray
>you are correct. However, I have seen too many little bulges coming
>from ill prepared cars to think you are right about that.
>
>If It were me restoring a "3", I'd make sure that I erred on the side of
>safety, meaning that if there was ant possibility that the covered rust
>theory is incorrect, I'd certainly get rid of the rust.
>
>I'm sure you don't intend to do that again soon.
>
>Too much Time, Too much work, Too much money not to do it right.
>
>Joe Curry
>
>George P. Richardson wrote:
>>
>> Rust contains oxygen, but the iron does not. Isolate iron from oxygen
and
>> it can't rust.
>> Even if you cover rusty metal with paint, once the oxygen trapped below
the
>> paint is converted to iron oxide, rusting will cease.
>>
>> The rusting occurs when the coating is not keeping out oxygen, such as
when
>> the paint is scratched or peeling. In the case of frame members, these
are
>> often not painted inside, and so rust starts inside.
>>
>> George Richardson
>> '57 TR3, TS15559L
>> (getting ready to paint - and now on the web!)
>> http://www.merlingroupinc.com/tr3.htm
>> -----Original Message-----
>> From: Joe Curry <spitlist@gte.net>
>> To: Triumphs Mail List <triumphs@autox.team.net>
>> Date: Thursday, February 12, 1998 10:49 PM
>> Subject: [Fwd: Rust elimination]
>>
>> >--
>> >"Thanks to the Interstate Highway System, it is now possible
>> > to travel across the country coast to coast without seeing
>> > anything." -- Charles Kuralt
>
>--
>"Thanks to the Interstate Highway System, it is now possible
> to travel across the country coast to coast without seeing
> anything." -- Charles Kuralt
>
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