In rec.autos.makers.vw.watercooled Fred Mann <famnn@[EMAIL PROTECTED]
> wrote:
> Hello,
> I have a small hole in the exhaust manifold right where it attaches to
the
> engine -- actually a small piece of the gasket is missing. There's a
little
> space in there that would seem ideally suited to accept a dollop of
foam.
> The foaming insulation at the hardware store can only deal with temps
below
> 200 degrees. Is there anything out there with a higher temp rating?
> (JB Weld works okay, but doesn't seem to last)
> Thanks!!!!
JBWeld will not handle the heat. Period. They explicitly say on the
package
not for exhausts and that its only good to 500 degrees, and honestly, I
don't even believe that. The exhaust there is probably closer to 1000
degrees. There is a product called "Hi-Temp Lab-Metal"
(www.alvinproducts.com)
which is supposed to be good to 1000 degrees. Honestly, even that may
not be enough. As with anything, it is strongly recommended the surface
is clean, dry, oil-free, and sanded so it is rough to promote adhesion.
They also claim you need to slowly heat it to 425F and then keep it there
in order to reach the claimed 1000 degrees. I think you might stand a
chance of doing that with a heat gun. I think using the engine to do
it would be unwise.
(Disclaimer: I am in no way associated with Alvin Products or any
distributor
of it. I have never seen, much less used one of their products in person.
In short, I'm not endorsing its use, only pointing out its existence)
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