Re: [TCML] Sonotube Preparation

[Steve Ward <steve.ward@xxxxxxxxx>]

Ah, ok, i was not aware of the purpose for this inner layer, thanks for
clearing it up.

Steve

On Mon, Jul 20, 2009 at 11:40 AM, DC Cox <resonance@xxxxxxxxxxxx> wrote:

> If the intertior is sealed, then not usually a problem.
>
> The Sonotubes are designed with a "release agent" on the interior of the
> tube.  They soak up water slowly from the concrete which then causes the
> tube to unravel thus making for almost automatic removal of the concrete
> form.
>
> It's always best to remove it is possible, and then seal with AC-43 or
> equivalent.  The idea is to prevent moisture from slowly being absorbed by
> the inner coating which may cause the tube to begin unraveling as it is
> designed to do when used in concrete form applications.
>
> The idea of anything "slowly soaking up moisture" is unsettling to me.
> Better to remove and reseal to eliminate the potential for later problems.
>
> Dr. Resonance
>
>
>
>
> On Sun, Jul 19, 2009 at 9:55 PM, Steve Ward <steve.ward@xxxxxxxxx> wrote:
>
> > Well, i can say that i never removed it on any of my sonotube forms.  Is
> > there any reason TO remove the inner layer?  It usually seems to be wax
> or
> > plastic film coated, i took this to be a *good thing*.
> >
> > Steve
> >
> > On Fri, Jul 17, 2009 at 1:05 AM, Jim Mora <wavetuner@xxxxxxxxx> wrote:
> >
> > > Hi Steve,
> > >
> > > I plan to wind a 22 or 24" sonotube in the future. I remember reading
> > that
> > > the interior wrap is also removed. If you are confident with not doing
> > that
> > > it sure would save some work!
> > >
> > > Jim Mora
> > >
> > > -----Original Message-----
> > > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf
> > > Of Steve Ward
> > > Sent: Monday, July 13, 2009 3:15 PM
> > > To: Tesla Coil Mailing List
> > > Subject: Re: [TCML] Sonotube Preparation
> > >
> > > Tyler,
> > >
> > > Having wound many coils on sono-tube, here is my method.
> > >
> > > 1) make sure the tube has been in a fairly dry place for awhile, if its
> > > soggy, throw it out and buy a new one ;-).
> > >
> > > 2) remove the outer layer of waxy paper with all the black ink printed
> on
> > > it.  Usually this will peel off carefully, if you are not so lucky you
> > can
> > > use an orbital sander to rip it all off.
> > >
> > > 3) give the rough cardboard form a nice heavy coat of polyurethane
> > varnish,
> > > the cardboard will soak it up real nice.
> > >
> > > 4) after the varnish dries, give it a little wipe down to remove any
> > large
> > > pieces of dust or anything, and wind the coil.
> > >
> > > 5) i give my coils 1 coat of varnish right after its done.  I let this
> > dry
> > > overnight, and the next day apply a good coat of pour-on epoxy (or more
> > > coats of varnish if you like).
> > >
> > > My sonotube coils have no problem hurling 10-12 foot sparks (4' tube).
> > >  They
> > > are nice and light weight, but they can be fragile.  I beef mine up
> with
> > > some internal baffles cut out of 3/8" plywood.  They are just a snug
> > > friction fit inside the tube, i use 2 baffles total (plus the 2 end
> caps,
> > > also plywood).
> > >
> > > Steve Ward
> > >
> > > On Mon, Jul 13, 2009 at 11:06 AM, Tyler Pauly <rpggod714@xxxxxxxxx>
> > wrote:
> > >
> > > >
> > > > Hello all,
> > > >
> > > > First, sorry for the previous message.  I must not know how to use
> > yahoo
> > > > mail....
> > > >
> > > > Anyways, I am getting ready to coat a 12" sonotube with some helmsman
> > > spar
> > > > varnish, but I'd like to get a general idea of how everyone else
> > prepares
> > > > their tube.
> > > >
> > > > I looked through the archives, but no one seemed to mention that
> theirs
> > > had
> > > > a wax coating on the inside.
> > > >
> > > > Regardless, I'm not sure what to do with it.  I don't believe the
> > varnish
> > > > will stick to it, but I fear pulling out the waxed layer will weaken
> > the
> > > > integrity of the form.
> > > >
> > > > Also, it has red and blue lettering on the outside.  Do I really need
> > to
> > > > sand off the outer layer of the sonotube because of this?  Maybe I'm
> > > > paranoid, but it seems like this could weaken it as well.
> > > >
> > > > I appreciate any suggestions or recommendations!
> > > >
> > > > Thanks,
> > > > Tyler
> > > >
> > > >
> > > >
> > > >
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