NAC: fiberglass fabrication
TWFAUST at aol.com
TWFAUST at aol.com
Mon Mar 21 21:57:54 EST 2005
> From: Igor Kessel <KBATPO at comcast.net>
> Subject: NAC: fiberglass fabrication
> To: Audi S-list <s-car-list at audifans.com>, Audi Q-list
> <quattro at audifans.com>
> Message-ID: <423F73B7.7000807 at comcast.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Folks,
> can any of you either recommend the literature or better yet personally
> teach one very receptive (and humble too, I might add :) ) DIY quick
> learner and Audi fanatic how to fabricate laminated fibreglass panels? I
> will supply all the beer and junk food that the intensive thought
> process will require.
>
>
The usual method is to make up a form/mold, smaller items have molds cast in
plaster. Larger molds are made of plywood, or similar, with a plaster liner to
capture the mold.The form is them coated with a "release agent". This is
readily available, certainly in art supply stores. The fiberglass cloth (getting
harder to find in automotive shops in "woven", cloth like, form) is then soaked
in resin (with catalyst/hardner) and laid in the form. Multiple layers are
then added until the desired thickness is obtained. Art supply stores can also
supply coloring agents. If the finished surface is not as desired (there will
be small voids) the surface can be "painted" with thinned resin (there is a
"thinner" available. Can't think of a brand name. Once again this is an art
supply, or woodworking store, product. Auto supply stores won't carry it) and then
sanded to the desired finish. Wes Products makes very nice stuff, including
the cloth. Some of their cloth is too thin for automotive use without a lot of
layers. I have it on my rowing shell, it disappears under a coat of clear
resin/varnish. This would be found at woodworking or marine supply stores. Nuthin
to it.
Most modern fiberglass pieces are built up with "chopper guns". Fiberglass
strands, mixed with catalyzed resin, are shot under pressure into the molds. The
gun "chops" the strands. Similar to a spray painting technique. Not practical
for DIY.
Tom Faust
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