What's inside that case ? Is that a coating of some type ?
Glyptal 1201 (Some info on it below)
Although 1201 was originally developed as an insulating paint for electrical applications such as the treatment of coils and armatures, its outstanding resistance to corrosion, moisture, oil, acid, heat, dust and salt spray has made it popular throughout industry as a Primer, Sealer, Adhesive and Protective Finish. There are literally hundreds of uses for 1201.
Some of the more typical industry uses include:
Primer for structural iron and steel . General plant maintenance . Sealer for concrete floors
Primer and finish for motor, generator, and transformer housings
Anti-moisture coating on thermostat, water cooler, and truck control parts
Sealer for pipe and stud threads and vacuum systems
Anti-corrosion protection for winches ~nd other out- door apparatus
Electrical insulation for coils and armatures . Adhesive for gaskets
Coating for interior of hydraulic tanks, and bearing cases.
Superior performance from a superior paint.
Exhaustive tests conducted at the Glyptal laboratories confirm consistently favorable customer experience with 1201:
Meets Requirements of MIL-E-22118
Flexibility is far superior to competitive red sealers on both backed and air-dried films. 1201 can take rugged impact.
Water Resistance is excellent.
Prolonged Aging doesn't crack 1201's film, leaves no place for destructive agents to get in.
Fast Drying 1201 is tack-free in about thirty minutes at room temperature, can be baked to a beautiful smooth finish.
Heat Resistance. 1201 has got it, can withstand continuous 135°C temperatures for months.
Prolonged Heat. After 3700 hours at 35°C, there is no change in dielectric strength.
Toughness. High-gloss paints have a tender film. 1201 has a low-gloss finish, designed for great resistance to abrasion.
Adhesion. 1201 hangs on, stays where it's put-on metals, ceramic, porcelain, concrete, fibres, and wood.
Dielectric Strength is rated at 1500 volts per mil, permits thinner coating than most competitive paints.
Arc Resistance, even with air-dried films, is 480 seconds.