If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #4396
Joined: Mon Feb 06 2012, 11:58PM
Location:
Posts: 30
I used Humiseal 1B31. It has pretty decent dielectric properties, but the coolest thing about it is that it fluoresces under UV light, which makes it glow when the coil runs ;)
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Dr. Dark Current -
There's no varnish that can provide the thickness, ruggedness, insulation capabilities and appearance that can be obtained with a single coat of two-part clear epoxy. Done carefully, the finished secondary will look like it's encased in a glass sleeve. Over the past 10 years I've coated secondary coils of many different sizes with epoxy, and I'd NEVER go back to varnish.
Be careful of the type of epoxy you select. Do not use "laminating" epoxy, which is intended for use in composite construction along with layers of fiberglass, carbon, fiber, etc. The laminating grade epoxies usually do not cure to a hard, tack-free surface. You want a a material that's intended for use as a protective top-coat, and allows surfaces exposed to air to fully cure. In the US, Environmental Technonogies offers a product (Envirotex Lite) that works great. See:
I've previously posted a fairly detailed procedure for preparing and applying a two-part epoxy finish, see the thread "Clear epoxy secondary coatings". About halfway down the page is my post with the link to the procedure:
Registered Member #3883
Joined: Fri May 13 2011, 06:30PM
Location: Norway
Posts: 87
Herr Zapp wrote ... The laminating grade epoxies usually do not cure to a hard, tack-free surface.
I haven't tried enough different brands to say anything about them in general, but the epoxy I recommended (Biltema-brand) does cure to a hard finish eventually.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
PhilGood -
Yes, any unused material left in the bottom of your mixing cup will harden into a clear, hard disk.
If you set up everything before hand, there's no reason not to use any residual material as a potting compound, but it's difficult to know exactly how much residual resin there'll be until you are done coating the secondary.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Secondary coil coating/varnish type
