Coil Varnish — Air-Dry, 8 oz Tin

After you rewind a coil you need to lock the turns in place so vibration does not chafe the enamel off and create a short. Old shops dipped, baked, and pressure-impregnated. You probably do not have a vacuum chamber in your garage. This is the brush-on air-dry version that works when you are doing a one-off rewind and the customer needs the motor back by the weekend.

Specifications

• Volume: 8 fl oz / 237 ml
• Type: Modified alkyd, air-dry
• Dielectric strength: 1,400 V/mil after 72 hr cure
• Cure time: Tack-free 2 hr, full cure 72 hr at 70°F
• Coverage: Roughly one small motor stator per tin
• Cleanup: Mineral spirits

How to use it

Two thin coats beats one thick coat every time. Thin coats penetrate between turns and cure without skinning over before the solvent escapes. A thick coat skins on the outside and stays soft underneath — which defeats the purpose. Brush on the first coat, let it go tack-free (about two hours at room temperature), then brush the second. Full mechanical and dielectric strength at 72 hours.

What it does and doesn't do

Air-dry varnish locks turns, seals out moisture, and provides a dielectric barrier between adjacent conductors. It does not replace vacuum pressure impregnation for motors that run hot, wet, or under continuous heavy load. For a bench grinder, a small lathe motor, a vintage fan, or a hobby transformer — it is the right tool. For a pump motor running submerged or a compressor motor cycling all day, talk to a rewind shop with a dip tank.

Shipping note

Ships with ORM-D label via USPS Ground. Flammable liquid — cannot ship air.