Jim, this may be similar.... Available locally at Gregg Distributors.... I
use a product labeled as "Spayon" (by Sherwin Williams) 00600 Clear
Insulating Varnish. Says on can that dielectric strength is 1000 VPM
(volts per millimeter I guess). They also make a red version (SB-6-665)
with 1100 VPM. I use it routinely to seal antenna DE and balun connections
etc. Seems impervious to weathering....
73 Don
VE6JY
On Fri, Nov 7, 2014 at 6:58 AM, Jim Thomson <jim.thom@telus.net> wrote:
> I bought a spray bomb of this stuff back in the late 70s. It dries
> clear + hard.
> The HV standoff on it was phenomenal. A local buddy had a shunt
> fed tower for 160m, and the air variable cap inside would arc with just
> 100w.
> After spraying the GE stuff on...and let dry for a day or two... zero
> problems
> with arcing. I brought my small amp, that had 160m on it....and we
> stuffed
> 1.1 kw through it...and still no arcing.
>
> Another fellow had a yaseu FL-2100B amp... abt 650 w out....and they used a
> small broadcast style cap for the load cap. Barely .025 inch spacing. The
> cap
> arced on 15m..so the owner tried to clean out the carbon, and ended up
> bending the
> plates..and made a mess of it. They touched at one point in their
> rotation. I sprayed
> the GE in there.... and zero problems after that.... and the stator /rotor
> plates still
> rubbed. They were touching right where the load cap was tweaked for max
> po.
>
> For an experiment, I scrubbed all the gunk off my new (at the time in 1980)
> 6061-T6 tubing with steel wool /jets pads etc. This was for a hb 5 –el
> 10m yagi.
> Once super clean, dry and shiny... I doused the eles with the GE spray
> bomb.
> Those eles stayed shiny up until just a few years ago.
>
> It was amazing stuff.... and have tried to track it down over the years
> with very little
> success. It’s a cheap and easy way to HV insulate anything..and also
> useful for
> connectors, and a myriad of other uses. Does this stuff still exist? I
> think it may
> exist under a different designation or heading.
>
> Jim VE7RF
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