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    ELECTRICAL INSULATION VARNISH

    Ultimeg 2000-372 Red Alkyd Insulating Varnish Durable Protection for Electric Motors, Coils & Windings

    Ultimeg 2000-372 Red is a professional Class H alkyd electrical insulating varnish formulated to protect electric motor windings, coils, transformers and other electrical components from moisture, dust, oil and mechanical wear. Available in 5 litre containers, 25 litre drums and 210 litre drums, it provides a durable insulating coating for workshops, OEM manufacturers and high-volume production environments.

    Widely used by motor rewinders, electrical repair workshops and manufacturers, Ultimeg forms a tough protective finish that enhances dielectric performance while helping extend the service life of repaired and newly manufactured electrical equipment. Its distinctive red coating also makes treated components easy to identify during inspection and servicing.

    Key Features:

    • Excellent Electrical Insulation: Forms a durable insulating film to help improve dielectric strength and long-term electrical reliability.
    • Moisture & Contaminant Protection: Helps protect windings and electrical components from moisture, dust, oil and everyday contaminants.
    • Durable Alkyd Finish: Tough protective coating resists abrasion and normal operating conditions.
    • Ideal for Motor Rewinding: Suitable for electric motor repairs, transformer maintenance, coil impregnation and electrical insulation applications.
    • High-Visibility Red Finish: Makes treated components easy to identify after application and inspection.
    • Multiple Drum Sizes: Available in 5 L, 25 L and 210 L drums to suit maintenance workshops through to large-scale manufacturing.

    Applications:

    • Electric motor rewinding
    • Motor stators and rotors
    • Transformer coils
    • Electrical windings
    • Coil repairs and refurbishment
    • General electrical insulation applications

    Whether you require a 5 litre container for workshop use, a 25 litre drum for regular production, or a 210 litre drum for high-volume manufacturing, Ultimeg 2000-372 Red provides dependable Class H electrical insulation and long-lasting protection. Contact us for pricing, availability or assistance selecting the right insulating varnish for your application.

    Need more technical information?
    Scroll below for detailed technical specifications, drying & cure information, application methods, workshop tips, standards & performance, and frequently asked questions.
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    Drying & Cure Guide

    Typical drying and curing information for Ultimeg 2000-372 electrical insulating varnishes. Times may vary depending on film thickness, component size, airflow and workshop conditions.

    Touch Dry

    15 min

    Surface becomes touch dry at approximately 21°C.

    Handleable

    45–60 min

    Components can usually be handled carefully after this stage.

    Full Cure

    24–48 hrs

    Full cure at ambient temperature for maximum developed properties.

    Heat Cure

    2–3 hrs

    Accelerated cure by heating components at approximately 80°C.

    Workshop note:
    Heavily taped, tightly wound or larger components may retain solvent for longer. Heat curing can help reduce the risk of solvent entrapment and speed up final cure.
    Application Methods

    The Ultimeg 2000-372 range is available in both aerosol and liquid formats to suit different workshop requirements. Choose the application method that best matches your repair, maintenance or production process.

    Brush

    Ideal for touch-ups, repairs, stator windings and areas requiring precise varnish application.

    Dip

    Commonly used for complete coil impregnation and consistent coverage of smaller electrical components.

    Spray

    Aerosol cans are ideal for maintenance and touch-ups, while liquid varnish can be spray applied using suitable workshop equipment.

    Application note:
    Aerosol versions are supplied ready to use. Liquid varnishes may be thinned where required using compatible thinners, following the manufacturer's recommendations for the chosen application method.
    Workshop Tips

    Following good workshop practices helps achieve a more consistent finish, improved impregnation and reliable electrical insulation performance.

    Use at Room Temperature

    Cold varnish is thicker and may not flow or penetrate as effectively. Allow the product to reach normal workshop temperature before use where practical.

    Drain Excess Varnish

    After dip impregnation, allow excess varnish to drain before curing. This helps produce a more even coating and reduces runs or pooling.

    Heat Cure Large Windings

    Larger or tightly wound components benefit from heat curing to reduce solvent entrapment and achieve a more complete cure.

    Good workshop practice:
    Drying and curing times are influenced by coating thickness, airflow, humidity and component size. Always verify that the varnish is fully cured before placing electrical equipment into service or packaging components for storage.
    Standards & Performance

    Ultimeg 2000-372 has been independently tested to recognised international standards and is designed for demanding electrical insulation applications where long-term dielectric performance is essential.

    Class H

    Suitable for Class H (180°C) electrical insulation systems used in demanding industrial environments.

    UL1446 Recognised

    Recognised under UL File E220579 for use in Class H insulation systems.

    Tested Standards

    Conforms to BS EN 600464 Type 1.1 and has been tested to recognised ASTM electrical performance standards.

    Proven Performance

    Achieved a 20,000-hour performance rating at temperatures above 180°C during ASTM testing.

    Performance note:
    Published test results are based on laboratory testing under controlled conditions. Actual service life and performance will depend on operating temperature, component design, application method and environmental conditions.
    Frequently Asked Questions
    Can I use Ultimeg 2000-372 for motor rewinding?
    Yes. Ultimeg 2000-372 is designed for electrical insulation applications including motor rewinding, transformer repairs, coils, stators and other electrical windings requiring a durable Class H insulating varnish.
    What's the difference between the aerosol and 5 litre varnishes?
    Both products use the same Ultimeg 2000-372 varnish system. Aerosol cans are ideal for maintenance, touch-ups and smaller repairs, while the 5 litre liquid varnishes are better suited to motor rewinding, dip impregnation, brush application and larger workshop jobs.
    Can the liquid varnish be sprayed?
    Yes. The 5 litre varnish can be applied by brush, dip or spray using suitable workshop equipment. Where viscosity adjustment is required, always use the manufacturer's recommended thinner and follow the application instructions.
    How long does Ultimeg 2000-372 take to cure?
    Under normal workshop conditions, the varnish is touch dry in approximately 15 minutes, can usually be handled after 45–60 minutes and reaches a full ambient cure in 24–48 hours. Heat curing at approximately 80°C can significantly reduce curing time for larger components.
    Which colour should I choose?
    The choice is generally based on your application or workshop preference rather than electrical performance. Clear varnish maintains the appearance of windings and components, while coloured varnishes provide greater visibility during inspection and are often used to match existing equipment or manufacturing specifications.
    Technical data

    Ultimeg 2000-372 Technical Specifications

    Key technical information for Ultimeg 2000-372 anti-tracking alkyd insulating varnishes.

    Product type Anti-tracking air-drying alkyd insulating varnish
    Temperature class Class H, 180°C
    UL recognition UL File No. E220579
    Application methods Brush, dip or spray
    Viscosity 200–300 cPs at 25°C
    Specific gravity 0.96–0.99
    Non-volatile content 38–42%
    Flash point 27°C
    Shelf life 12 months at 21°C
    Touch dry 15 minutes at 21°C
    Hard dry 45–60 minutes at 21°C
    Full cure 24–48 hours at ambient temperature, or 2–3 hours at 80°C

    Compare Our Electrical Insulation Varnish Range

    Choose from aerosol varnishes for quick repairs and maintenance, or 5 litre liquid varnishes for motor rewinding, coil impregnation and workshop applications.

    Spray Varnishes

    Best for touch-ups, maintenance, hard-to-reach areas and smaller electrical insulation repairs.

    • Aerosol application
    • Anti-tracking protection
    • Quick workshop use

    Liquid Varnishes

    Best for motor rewinding, coil coating, brush application and larger workshop insulation work.

    • 5 litre workshop packs
    • Motor winding protection
    • Coil and transformer applications
    3GK Red Class H Anti-Tracking Varnish Spray 400ml aerosol can

    Class H red aerosol varnish for electrical insulation repairs and maintenance.

    Ultimeg 2000/372 Clear Anti-Tracking Varnish Spray 400ml aerosol can

    Clear Class H aerosol varnish for anti-tracking protection and touch-ups.

    Ultimeg 2000-372 Red Alkyd Insulating Varnish 5L drum front view

    Durable red insulating varnish for motors, transformers and electrical windings.

    Ultimeg 2000/372 Clear Alkyd Insulating Varnish 5L metal can front view

    Clear Class H insulating varnish for motor rewinding and electrical repairs.