Author Topic: F***-ups varnishing secondary  (Read 187 times)

Offline Zipdox

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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

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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.
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Offline Mads Barnkob

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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

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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

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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

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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 »

 


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