This is probably more than one wants to know about Glyptal (below). It
doesn't directly answer Theo's question of migration from electric to
automotive application. But, likely an enthusiast with knowledge of the
products capabilities tried it one day and as they say, "the rest is
history." Or, perhaps the military was looking for a product with Glyptal's
capabilities (it does have a MIL spec.) and that might be how it found it's
way into automotive applications.
Tom
Although Glyptal 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 135B0C
temperatures for months.
Prolonged Heat. After 3700 hours at 35B0C, 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.
Seals pores left in metal after bead blasting.
Helps keep oil clean and flowing freely.
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