Author Topic: F***-ups varnishing secondary  (Read 463 times)

Offline Zipdox

  • High Voltage Enthusiast
  • *
  • Posts: 46
  • Karma: +0/-0
    • View Profile
F***-ups varnishing secondary
« on: March 17, 2020, 07:25:45 PM »
So I bought some PU varnish and did the first coat early this afternoon using a rotating LEGO contraption.

Since you're reading this post I just messed up doing the second coat. I should probably have waited longer for the first coat to dry. I also found out that the varnish is meant to be sprayed on...

RIP surface finish.

Tomorrow I'll see how it looks and hopefully a third coat will cover the roughness a bit.

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 201
  • Karma: +4/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: F***-ups varnishing secondary
« Reply #1 on: March 17, 2020, 07:35:31 PM »
You don't have to spray varnish. You can use a brush. I have always used a brush with excellent results. The trick is that you have to continuously rotate the secondary until each coat is dry. You can use a hair dryer to speed things up.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1430
  • Karma: +24/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: F***-ups varnishing secondary
« Reply #2 on: March 17, 2020, 08:48:24 PM »
The best results come with more thin layers when using polyurethane varnish. Even letting it harden up enough to give it a light sanding between layers will give a more even result as well.

I have very bad experience with spray on varnish, I only use brush on as well.

Sand it down before your 3rd coating if you want to even the surface, just be careful not to damage the original coating of the wire!
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline John123

  • High Voltage Technician
  • ***
  • Posts: 155
  • Karma: +2/-0
  • All the gear, no idea. UK
    • View Profile
Re: F***-ups varnishing secondary
« Reply #3 on: March 17, 2020, 09:57:50 PM »
Does that mean its doomed to arc over when powered up now?

Offline Zipdox

  • High Voltage Enthusiast
  • *
  • Posts: 46
  • Karma: +0/-0
    • View Profile
Re: F***-ups varnishing secondary
« Reply #4 on: March 18, 2020, 12:35:25 AM »
Does that mean its doomed to arc over when powered up now?
Probably not, I can add more varnish.

Offline Zipdox

  • High Voltage Enthusiast
  • *
  • Posts: 46
  • Karma: +0/-0
    • View Profile
Re: F***-ups varnishing secondary
« Reply #5 on: March 18, 2020, 12:36:33 AM »
The best results come with more thin layers when using polyurethane varnish. Even letting it harden up enough to give it a light sanding between layers will give a more even result as well.

I have very bad experience with spray on varnish, I only use brush on as well.

Sand it down before your 3rd coating if you want to even the surface, just be careful not to damage the original coating of the wire!
I will see if sanding is required. And I'll use a hot air station to pop bubbles and hair dryer to make it cure faster.

High Voltage Forum

Re: F***-ups varnishing secondary
« Reply #5 on: March 18, 2020, 12:36:33 AM »

 


* Recent Topics and Posts

post Measuring LED efficiency
[Light, Lasers and Optics]
TMaxElectronics
Today at 12:46:23 AM
post Re: Configuration of a half bridge.
[Electronic Circuits]
hammertone
July 07, 2020, 10:28:37 PM
post Re: Configuration of a half bridge.
[Electronic Circuits]
ElectroXa
July 07, 2020, 10:09:22 PM
post Re: Configuration of a half bridge.
[Electronic Circuits]
hammertone
July 07, 2020, 09:36:53 PM
post Re: Configuration of a half bridge.
[Electronic Circuits]
johnf
July 07, 2020, 09:20:12 PM
post Configuration of a half bridge.
[Electronic Circuits]
hammertone
July 07, 2020, 09:07:10 PM
post Re: Help needed: HV Driver circuit
[Transformer (Ferrite Core)]
T3sl4co1l
July 06, 2020, 10:29:17 PM
post Re: induction heater troubleshooting help
[Electronic Circuits]
petespaco
July 06, 2020, 06:53:26 PM
post Re: adventures in homemade flyback bobbins.
[Transformer (Ferrite Core)]
HighVoltageRulezz
July 06, 2020, 01:18:03 PM
post Re: Help needed: HV Driver circuit
[Transformer (Ferrite Core)]
HighVoltageRulezz
July 06, 2020, 01:05:32 PM
post Re: Help needed: HV Driver circuit
[Transformer (Ferrite Core)]
T3sl4co1l
July 06, 2020, 06:14:56 AM
post Re: Cathodes in Compact Fluorescent Lamps
[Light, Lasers and Optics]
klugesmith
July 05, 2020, 06:31:21 PM
post Re: Cathodes in Compact Fluorescent Lamps
[Light, Lasers and Optics]
HiVi
July 05, 2020, 12:30:02 PM
post Re: IGBTs keep dying (un-solved again)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
July 04, 2020, 10:35:50 PM
post Re: IGBTs keep dying (un-solved again)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 04, 2020, 08:56:15 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
July 04, 2020, 04:37:32 PM
post Re: IGBTs keep dying (un-solved again)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
July 04, 2020, 04:14:44 PM
post Dell PowerEdge M1000E Blade Server Teardown
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Mads Barnkob
July 04, 2020, 01:52:14 PM
post Help needed: HV Driver circuit
[Transformer (Ferrite Core)]
HighVoltageRulezz
July 04, 2020, 12:37:48 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
July 04, 2020, 12:17:47 AM
post Cathodes in Compact Fluorescent Lamps
[Light, Lasers and Optics]
klugesmith
July 03, 2020, 07:12:18 AM
post Re: What's needed to heat up 0.75 g of SiC (susceptor) mass until it turns dim-red??
[Radio Frequency]
klugesmith
July 03, 2020, 06:36:16 AM
post Re: IGBTs keep dying (un-solved again)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 03, 2020, 04:20:42 AM
post Re: "Slayer exciter" analysis
[Solid State Tesla Coils (SSTC)]
acmq
July 03, 2020, 03:01:56 AM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
AstRii
July 02, 2020, 11:17:48 PM
post Re: How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
MRMILSTAR
July 02, 2020, 11:09:25 PM
post Re: Differential probe testing setup
[Laboratories, Equipment and Tools]
TMaxElectronics
July 02, 2020, 10:57:02 PM
post Re: Differential probe testing setup
[Laboratories, Equipment and Tools]
Twospoons
July 02, 2020, 10:47:18 PM
post Re: How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
johnf
July 02, 2020, 09:03:20 PM
post Re: How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
DJthefirst
July 02, 2020, 08:01:03 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
July 02, 2020, 07:04:55 PM
post Re: How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
July 02, 2020, 07:02:30 PM
post Re: IGBTs keep dying (solved for now)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
July 02, 2020, 06:51:20 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
AstRii
July 02, 2020, 05:34:23 PM
post Re: How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
DJthefirst
July 02, 2020, 05:09:09 PM
post Re: How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
July 02, 2020, 12:51:29 PM
post Differential probe testing setup
[Laboratories, Equipment and Tools]
TMaxElectronics
July 02, 2020, 12:20:18 PM
post Re: How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
MRMILSTAR
July 02, 2020, 05:30:41 AM
post How to prevent secondary oxidation / Rust
[Dual Resonant Solid State Tesla coils (DRSSTC)]
DJthefirst
July 02, 2020, 04:16:58 AM
post Re: induction heater troubleshooting help
[Electronic Circuits]
petespaco
July 02, 2020, 01:02:02 AM
post Re: What's needed to heat up 0.75 g of SiC (susceptor) mass until it turns dim-red??
[Radio Frequency]
T3sl4co1l
July 01, 2020, 06:54:30 AM
post Re: "Slayer exciter" analysis
[Solid State Tesla Coils (SSTC)]
T3sl4co1l
July 01, 2020, 06:25:30 AM
post Re: "Slayer exciter" analysis
[Solid State Tesla Coils (SSTC)]
acmq
July 01, 2020, 02:47:13 AM
post Re: A three-phase "tree phase" Tesla coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Steve Ward
July 01, 2020, 02:43:34 AM
post Re: induction heater troubleshooting help
[Electronic Circuits]
aes92000
July 01, 2020, 02:33:07 AM
post Re: induction heater troubleshooting help
[Electronic Circuits]
petespaco
July 01, 2020, 12:03:08 AM
post Re: induction heater troubleshooting help
[Electronic Circuits]
aes92000
June 30, 2020, 10:34:36 PM
post Re: E-Bay Marx generator
[Voltage Multipliers]
ritaismyconscience
June 30, 2020, 09:14:06 PM
post Re: What's needed to heat up 0.75 g of SiC (susceptor) mass until it turns dim-red??
[Radio Frequency]
ritaismyconscience
June 30, 2020, 09:05:32 PM
post Re: induction heater troubleshooting help
[Electronic Circuits]
ritaismyconscience
June 30, 2020, 09:01:55 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal