Date: Fri, 23 Oct 2009 14:37:17 -0700
Reply-To: dylan <insyncro@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: dylan <insyncro@YAHOO.COM>
Subject: Re: Rusty exhaust. Paint?
In-Reply-To: <bbb34d60910231400m3de15b65y8203cb16efdf498b@mail.gmail.com>
Content-Type: text/plain; charset=iso-8859-1
I agree.
Good lookin' out.
Ceramic coating, JET coating and all of the inner and outer processes should be done to brand new material, not a used exhaust system.
I think Z was looking for some ideas to make an existing exhaust look better and last a little longer.
df
________________________________
From: Janne Ruohomäki <janne.ruohomaki@gmail.com>
To: dylan <insyncro@yahoo.com>
Cc: vanagon@gerry.vanagon.com
Sent: Fri, October 23, 2009 5:00:44 PM
Subject: Re: Rusty exhaust. Paint?
On Fri, Oct 23, 2009 at 10:38 PM, dylan <insyncro@yahoo.com> wrote:
> I have had very good luck properly wrapping steel exhaust systems.
> Two layers of wrap, cross laminate the windings and use DEI silcone sealant on the wrap to keep all moisture
> out. I used 1 inch or 1.5 inch first, than 2 inch wide over top. It comes in colors.
Now small warning on these wrappings: they probably don't contain
asbestos anymore, some old ones even might have it as it has almost
unbeatable insulation properties. Some newer ones contain vermiculite
which has quite similar properties in every way, and is legal to use
today. Now everything is fine when that stays at its place, having
neither of these materials in Your car (or apartment) is not going to
harm You.
Problem arises when repair work is done: dust. Dust from both asbestos
and vermiculite causes lung cancer. Don't cut it with a tool that
creates dust. If You have to cut it use water with some slow moving
tool that does not heat the point You are cutting and takes out as
coarse bits as possible when working with it. Also take care that You
wont leave this dirty water You get in this process to dry in Your
garage floor or any other place as it will float in the air again in
no time after it dries.
The same goes actually for fibre glass to some extent, but its nowhere
near as potent carcinogen as the two former. If You want some serious
heat insulation You will go with vermiculite nevertheless.
I have never used any wrapping of this kind, but I am familiar with
vermiculite through hydroponics and it does make quite a bit of dust
at least if handled when dry. Other substances in these wrappings
probably make it create less dust and it probably will be mostly
heavier, but this is some dust You don't want to get to Your lungs.
And as endnote I think that the outside of exhaust system is the wrong
side to put heat insulation on: the insulation needs to be on the
inside of the exhaust system. So that it will actually make the steel
that the exhaust system is made of cooler, not hotter. I hate
repairing rusty and brittled exhausts. After getting ceramic coating
on the inside if I still needed to put some insulation I would put in
over those heat sensitive components. And of course route the intake
air from somewhere cooler place.
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