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  • Air Drying Varnish

Electrical Insulating Air Drying Varnish - 250ml (CLEAR)

£9.95 (inc VAT) £8.29 (exc VAT)
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Product Description

250ml Clear Electrical Insulating Air Drying Varnish

Ideal for electric motor windings, transformer coils, tesla coils, solonoid coils and almost any coil winding application that requires insulating, bonding & sealing. This varnish can also be used as an anti-tracking coat on printed circuit boards and components. Can be applied to windings using a small paint brush or components can be dipped.


General Description…

A reliable & convenient air-drying varnish designed for the electrical industry. Anti-tracking varnish provides a tough, impervious, insulating seal in difficult environments. The system dries rapidly in thin film to give very effective sealing off of electrical leakage paths together with excellent noise reduction characteristics. The cured product conforms to BS 5629 type 1.1 (IEC 464), has excellent resistance to transformer oils and moisture, and is suitable for use in Class B and F insulating systems. A low hazard fungicide is included in the varnished enamels, which gives a 0 rating (no growth) fungal resistance when tested to BS 3900 PTG6.



Colour: CLEAR

Drying Time:   Touch Dry In 15 Minutes,  Hard Dry In 60 Minutes,  Full Cure In 24 Hour

Method:  Brush, Dip or Spray

Breakdown Voltage:  (20°C) 1200v/ml


6 Colour Variations Available


Full data & safety sheets are provided on request

Shipping Weight Per Bottle is: 320 Grams

A note about shipping: Due to postage restrictions on the allowable volume of varnish per package, if more than 1 bottle is purchased, each item is shipped individually.

Product Reviews

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  1. magnet wire

    Posted by Ian Morgan on 24th Jun 2021

    I use Brocott magnet wire to wind audio transformers. The quality is very good! Highly recommended!
    Have just ordered air drying varnish, not used it as yet but I’m sure it will serve my purposes.

  2. used for armatures on classic cars

    Posted by A Turner on 14th Nov 2019

    I am a professional rebuilder of wiper-motors for classic cars. I use several products from Brocott.
    This varnish I use to stabilise and protect windings, both field coils and armatures. It's easy to apply and works well.
    There are two problems I've found.
    Once opened the life is quite short, if you store with air in the container. I split the contents into three small jars once I have opened it. I make them really full.
    Doing this it keeps well and I can use it all up. You'd be OK if you used more than I do. But a little goes a long way on small motors.
    It hardens in air OK on field-coils but armatures have internal recesses and even if left for a few days it tends to spin out when I run them. This makes a sticky mess. So these I oven dry at about 80C for an hour.
    Hopes this helps someone.

    The varnish can also be thinned down slightly with a xylene thinner to maintain the viscosity. Even though it is an air drying varnish, heating of the stator or armature prior or post application will always result in a quicker cure time and a fuller cure.

  3. Excellent varnish

    Posted by Skipmeister on 4th Mar 2019

    This air-drying varnish is easy to apply using a brush. It soaks in beautifully and dries quickly. Brushes can be washed in white spirit followed by Swarfega and detergent. Good stuff all round!

  4. Winding varnish keeps coil layers together and stable

    Posted by Carl on 12th Mar 2018

    Perfect product, adds insulation and stability to any number of windings.

  5. Good order

    Posted by Mr. Jussi Rautanen on 23rd Sep 2014

    Electrical Insulating Air Drying Varnish - 100ml bottle arrived in good condition and delivery was quick.