Date: Thu, 05 Aug 1999 15:22:47 -0500
From: John Reynolds <Johnr63@cwix.com>
Subject: Re: baidarka ALEUT LASHINGS
To: baidarka@lists.intelenet.net, baidarka@lists.intelenet.net
I used to live in Portland and there was a huge industrial casting faculity
there. There was always a large pile of molds and plugs wating to be carted
off to the dump. Most of these were made of wood or wood and Bondo like
substance. They usually had a coating of a silvery slick mold release on
them. Clearly you can use mold release agents on wood.
John Reynolds
----------
>From: Lew Plummer <jayhawk@sos.net>
>To: baidarka@lists.intelenet.net
>Subject: Re: baidarka ALEUT LASHINGS
>Date: Thu, Aug 5, 1999, 1:17 AM
>
>All the mold releases I know of are designed for smooth hard surfaces not
>porous course surfaces like wood so I wouldn't consider it. Wrapping the
>frame in cellophane idea is a good one. Glad wrap wouldn't be bad either
>but that, that couldn't be reached would stay with the boat for a long
>time.
>
>Bill Low suggests polyester, not bad idea, but I don't think it stretches
>as well as nylon -- what do you think Bill?
>
>Regards, Lew Plummer
>
>Ve Smith wrote:
>
>> Dyson skinned the entire boat frame with cellophane,shrank it,
>> 'glassed it, then dissolved the cellophane. He chose cellophane because
>> it (1) can be shrunk by misting with water (2) is insoluble in at least
>> some organic solvents (3)is soluble in water (and probably other polar
>> solvents as well)and (4) is cheap.
>>
>> Another material with similar properties is PolyVinyl Alcohol (PVA),
>> which is used as a realease film in epoxy molding. It is available
>> either as a brushable/sprayable solution or as a solid film. It is
>> insoluble in most organic solvents, but is soluble in water, so you
>> could presumably cover your boat with PVA film, skin and paint it, then
>> wash out the PVA. Sounds like a big mess to me, but should be possible.
>> PVA is also a thermoplastic and can be heat sealed, and may be
>> shrinkable in some way for all I know.
>>
>> A simpler way to prevent sticking might be to take strips of
>> polyethylene and wrap them in long spirals down the stringers, then
>> just leave them in; the skin would hold them in place even if whatever
>> they were fastened with failed. Polyethylene is almost as
>> stick-resistant as teflon, has high abrasion resistance and lubricity,
>> is available everywhere, and is damn near free.
>>
>> Or you could just do the simple thing and switch to polyester skin.
>>
>> --- woodall <woodall@mail.transport.com> wrote:
>> > Seems like one could use the mold release or similar
>> > product on the
>> > stringers and keel, cover or wrap them with
>> > cellophane, then skin and coat
>> > the frame.
>>
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>
>