Re: polyurethan

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Hollmike-at-aol-dot-com>

I still don't know why more people don't use the Sprayon brand insulating
varnish.  It is so much easier and faster.  It has 2100V/mil dielectric
strength and is intended for transformer windings, motor winding etc.  I won't
use anything else.  Since it is applied from a spray can, it dries very fast(I
put it on heavy enough on the first coat to soak the windings and then just
used a couple of light coats after that.  I only spent maybe fifteen minutes
total to do the actual coating and my coil was ready to fire the same day.  I
don't know if there are other distributors, but Grainger has it in stock.   
Mike 


>
> Frank, 
> I assume the caulking gun tube you are looking at is labeled polyurethane,
> not 
> polyurethan. There are many compounds of polyurethane that can be put into a 
> caulking gun tube, including adhesives and a polyu foam. The material you 
> want to use for coating a coil is polyurethane varnish. MinWax polyurethane 
> varnish is excellent 
> for that purpose and it's easily available. Apply 10-15 coats with a brush 
> while the coil form rotates slowly 
> on your winder. That way you wont get any drips and the results is a smooth 
> glasslike 
> finish. 
>
> Happy day, 
> Ralph Zekelman 
>
>