RE: Water absorbtion of Gray PVC

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

Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com> 

I dare say that I've seen far more successful secondaries built without
sanding and Glyptal than I have seen engines without changing oil.

Further, the secondary failures that I have seen have all been due to
racing arcs or pri-sec arcing, affecting only the exterior surface of
the coil, generally polyurethane.  I've never heard of a failure
originating on the form _beneath_ the winding.

Gary Lau
MA, USA


 >Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >
 >All PVC is hygroscopic especially when used at high frequencies.  It's
best
 >to sand interior and exterior, then paint with 3 separate of Glyptal or
 >other HV insulation.  Interior sanding is rapidly accomplished by using
a
 >sanding "flapper" on a dowel (or other extender) on an electric drill.
 >
 >Some experimenters would say this is totally not necessary.  I recall a
 >friend in high school who put over 90,000 miles on his Mustang without
ever
 >changing the oil . . . . . . . . . . . . . . . .but, I can't recommend
this
 >procedure.
 >
 >Dr. Resonance