RE: [TCML] Polyurethane Finish Questions

["Lau, Gary" <Gary.Lau@xxxxxx>]

Hi Greg,

Just how much cleaning is needed?  If it's just surface dust from lying on a shelf, I would imagine that pretty much anything will do - water, Windex, rubbing alcohol, whatever, provided you give it sufficient time to dry thoroughly after cleaning.  If you're in a hurry to use it, then avoid the water-based products.

As far as metallic drying agents, I've not heard that, but I've not looked into it.  Realize that polyurethane is made strictly for finishing floors and such, and that insulative qualities are not likely taken into consideration in their formulations.  Also, dielectric constant and dissipation factors are don't-cares for covering a secondary.   This is why acrylic is OK to wind a secondary on, but not OK as a tank cap dielectric.  But my gut tells me that as long as the product is clear, it's probably OK to cover a coil with.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of G Hunter
> Sent: Tuesday, April 21, 2009 9:10 PM
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Polyurethane Finish Questions
> 
> 
> What's the safest way to clean a secondary coil coated with oil based
> polyurethane?  I have paint thinner and also denatured alcohol on-hand.  Should I
> buy turpentine or mineral spirits?  I don't want to ruin the glossy finish.  I just want
> to clean off dust, dirt, and fingerprints.
> 
> I've also recently read that polyurethane oil finishes may contain metallic drying
> agents, including zinc. Metals in the varnish? Seriously? Why doesn't this ruin the
> dielectric qualities of the cured poly?
> 
> Cheers,
> 
> Greg

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