Re: Polyurethane (fwd)

["Tesla list" <tesla-at-xxxxxxxxxx>]

Original poster: Tesla List Moderator <mod1-at-poodle.pupman-dot-com>



---------- Forwarded message ----------
Date: Sun, 26 Nov 2000 07:14:59 -0600
From: BunnyKiller <bigfoo39-at-telocity-dot-com>
To: Tesla list <tesla-at-pupman-dot-com>
Subject: Re: Polyurethane (fwd)

Tesla list wrote:

> Original poster: Tesla List Moderator <mod1-at-poodle.pupman-dot-com>
>
> ---------- Forwarded message ----------
> Date: Tue, 5 Dec 2000 11:14:33 EST
> From: Esondrmn-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: Polyurethane
>
> I plan to re-wind my small coil this weekend.  The form is acrylic.  Does
> anyone know if polyurethane (oil based) will attack acrylic?  I know some
> solvents will cause acrylic to crack, like thousands of small cracks
> (craze?).  Does anyone have an acrylic form with polyurethane on it?
>
> Thanks,
>
> Ed Sonderman

Hi Ed ...

I have an 8" form ( lexan) with an oil based poly on it and so far it hasnt
begun to craze or crack ( its been almost 2 years now). If you plan to go
ahead with your plans, take the extra time to keep the drips and overspray
off of the portions of the tube you want to keep clear.  It will look really
nice once its done. There is one thing I must mention tho...  temperature
changes ( about 60 degrees worth (( 90 - 30)) will cause the poly to
"seperate" at about 1" intervals all the way up the coil. Im figuring that
the copper contracted faster/slower than the poly and lexan and caused the
splitting. Altho the splitting hasnt yey caused any flashover or arcing
problems but that is another story to see about later on.

Scot D