dsmald(at)aol.com
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 Posted: Wed Feb 03, 2010 6:40 pm Post subject: Kolb-List Digest: Spray foam 02/02/10 |
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| Quote: | | Quote: | ________________________________ Message 4 _____________________________________
Time: 06:32:25 AM PST US
From: robert bean <slyck(at)frontiernet.net>
Subject: Re: dynamic balancing
Don't do it. -At least if you are considering the "stuff" in the little
cans.
I tried it in a motor vehicle once and it wicks and holds moisture.
Rusted out faster than ever.
BB
On 2, Feb 2010, at 8:50 AM, Mike Welch wrote:
> > By the way, has anyone ever put the
> > spray in foam into the wing panels close to the root through the
inspection
> > holes? Ted
>
> Ted,
>
> Although the foam might be a good idea, you do have to be careful.
There are 3 grades of the stuff (at least three that I know of). The
grades vary by how much expansion pressure they have. The weak grade is
for window gaps, etc. It doesn't distort the structure. The strong
grade can and will spread apart the structure gap, like in a door frame
gap. It can actually ruin the door fits to where it won't close
anymore.
> If you were to try using this foam, I'd recommend the middle
expansion foam, and try it in a test area first. It would not be wise
just to start spraying blobs of foam everywhere, only to find you've now
got wings with bulgy muscles. 
>
> Mike Welch
> Do not archive
I used to "shoot" polyurethane expanding foam into brand new Cadillac car bodies before final assembly.
2 shots on each side went into the plenum (area behind the dash) 4 went into the rockers on each side, and 2 on each side into the sail panels.
The engineers said it adds a LOT of strength to the hollow cavities and also deadens sound.
It is similar to the Great Stuff spray can foam available at hardware stores but is a 2 part resin and catalyst heated to 190 degrees and would expand many times it's original volume
and be fully cured in 60 seconds.
I personally would not use any spray foam and expect it to adhere to wing fabric, but you will never get it fully out of your coveralls!
I can't say anything about it wicking moisture, but if it is used in a relatively sealed and rigid area like tubing, I wouldn't think it would be a problem.
Also, for anyone who knows Bill Pickett in Midland, MI., check this link below. He did my written test for ASC ... Know your ice thickness!!
http://www.wnem.com/video/22405251/index.html
Darren, FS1, temporarily soaking up some FL sunshine!
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