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Insulation Coatings

MG Chemicals’ Insulation Coatings line are a unique line of varnishes for electronics products intended to provide added insulation to high voltage parts, such as transformer coils, motor windings, and sheathing for wires. Characterized by high dielectric strength, these 1-part coatings adhere to a variety of substrates and offer exceptional protection against corrosion.

Features & Benefits


  • Replacement for shrink wrap or electrical tape
  • Arc and corona resistance for transformer coils and motor windings
  • Insulation coatings for electrical generators


4226A – Clear Insulating Varnish – Clear, high gloss insulation coating with a very high dielectric strength – Free of Xylene, Toluene, and MEK

4228 – Dielectric Coating – Red, high gloss insulation coating with excellent dielectric properties. Direct cross to Glyptal 1201A

4228A – Red Insulating Varnish – Red, HAPs-free, 1-part, low-viscosity varnish

Insulation Coatings FAQs

What Is Insulating Varnish?

Insulating varnishes are resins like epoxies or alkyds used to protect high voltage machines such as transformers, motors and generators from electrical failure. They are applied over electrical conductors to provide a layer of electrical isolation and prevent shorting. While very similar to conformal coatings, these systems have superior dielectric properties, which makes them a better choice for applications like insulating windings and coils.

How To Use Red Insulating Varnish

Red insulating varnish is an alkyd resin with exceptional dielectric strength, used to electrically isolate conductors in windings and coils. It is applied like a conventional paint, by dipping, brushing and spray. However, the sheer size of some motors renders these methods unfeasible. In such circumstances, vacuum impregnation is employed, where large vacuums transfer liquid resin from a holding tank to a coating chamber, essentially encapsulating exposed wires.