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Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
Your question wasn't very descriptive. I'm not sure what you meant either. Are you talking about coating the wire with say epoxy or varnish or something? Or do you mean to stop flash over between primary and secondary? A little more information on what you want will help.
Registered Member #1198
Joined: Sat Dec 29 2007, 05:39AM
Location: Seattle, WA
Posts: 21
I used Minwawx Polycrylic spray on varnish. I used about half a spray can to put three coats on a 4.5"x18" secondary. Since it is a fast drying spray I didn't have to rig anything to turn the coil to avoid drips.] and I could re-coat in 30 minutes. One other nice feature is that the varnish is water-based so there are less VOCs and cleanup is easy.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Almost any varnish, lacquer, paint will be ok, except for metallic or carbon paints. I like to use polyurethane varnish. Yacht varnish, floor varnish, wood varnish etc. The coating has three main purposes; 1) To fix the wire in place. No matter how tightly you wind your secondary, the windings will eventually slip. 2) Physical protection against knocks and bumps. 3) Cosmetic. A heavily varnished coil looks good (to me).
Typically there will be only a few hundred volts peak between one turn and the next, so the coating is not for inter-turn insulation. Typically there will be 100 kV between the coil winding and earth, and a thin layer of insulating material will not insulate such a high voltage. So the coating (lacquer, paint, epoxy resin etc.) is NOT for insulation !
I try to avoid aerosol cans so I use liquid varnish. This needs either many thin layers (slow/boring/tedious), or a few thick layers - which requires some way of rotating the coil whilst the lacquer hardens for a smooth finish. So build a small rig for rotating the coil (by hand or motor) for winding and coating the coil.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Ive used many different kinds.
The water based kind looked very nice with a lot of coats and it does dry faster but after about 2 years the coil had cracks all over it it and the varnish turned yellow in some spots.
The regular spray or paint on types are good but you'll have to wait awhile to re coat.
I use glaze coat now epoxy for furniture. It takes longer to dry and it might need to be rotated but you will get the strongest and best looking secondary with it. You can even clean it with alcohol or acetone without messing it up.
Basically the cheap fast ways are just that. Cheap and fast but wont last as long.
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