Re: chassis stiffening: foam in the rockers...

[Gary Huff <scirocco86@home.com>]

Por-15 then foam? Something to seal it so moisture can not creep through..... like any good factory chassis/paint/rust protection job should have done. Opinions? Peace,
	-Gary Huff



On Sat, Jun 30, 2001 at 01:17:34AM -0400, Dan wrote:
> On Fri, Jun 29, 2001 at 11:51:40PM -0400, Shawn C Meze wrote:
> 
> > How so? 
> > The foam that ive seen would go into a void and expand. Since its not a
> > porus sort of confection how could moisture get in? 
> 
> It is pourus to some extent... look at any older Boston Whaler boat where
> someone neglected to seal a thru-hull fitting properly...  or ask a 914
> pwner what they think of Porsche's use of urethane foam to fill the
> windsheild support members.  Water wicks in and during the freeze-thaw
> cycle seperates the foam from the metal, advancing the water
> intrusion.  They rust from the inside out... By the time you see any
> surface defects, it is too late to do anything.
> 
> I think it would
> > probably do a good job but my recollection is that this stuff is actually
> > pretty heavy (as foam goes.)
> 
> Depends on the mix ratio of the 2 parts... At one company I worked for, we
> spec'd a pour-in-place foam from a company called "Structured Platics", in
> Kennesaw, GA IIRC.  We just needed a light molded thermal inulation part,
> but they showed us all kinds of aplications.  Urethane come can be cast
> dense enough that it feels (and carves&cuts) like a good hardwood, or
> extrruded into packaging pellets less dense than styrofoam peanuts.
> 
> Dan
> 
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