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To: Amplifier Mailing List <>
Subject: Re: [Amps] Anti-Corona Paint AND MILD SCREW/BOLT LOCKING MATERIAL
From: Gene May <>
Date: Mon, 26 Dec 2011 17:23:54 -0500
List-post: <">>
If  VE3CUI/VE3XZ is referrring to "Glyptal", I knew it as a thick, gooey liquid 
material used to hold screws such as on variable inductors in place against 
vibration.  It is/was a "reddish-brown anti-corona brush-on dope", applied with 
a small brush to the threads in adjustable components for semi-permanent 
locking or "fixing", before final shipping.  It was analagous to the various 
colors of "LokTite" that are used to lock bolts and nuts, except that it was 
considerably less "grabby" and permanent than these LokTites, i.e., took much 
less force to break it loose to make an adjustment as compared to the LokTites. 
 The LokTites seemed to be designed for mechanical devices and machinery that 
see much higher G-forces.  I've never heard of it used as an anti-corona paint, 
but that doesn't mean that it isn't also useful for that.  Since it was often 
used in commercial production, it should still be available from the usual big 
commercial suppliers.
I've never heard of a material designed to be "anti-corona" and am interested 
since I have an application for such a material.  I'm open to suggestions and 
would appreciate any.
Gene May

> From:
> Date: Sat, 24 Dec 2011 10:52:59 -0500
> To:
> Subject: [Amps] Anti-Corona Paint
> Hi Guys,
> Does anyone know of a good substitute for the old reddish-brown anti-corona 
> brush-on dope that was sold under the trade name of, I believe, "Glyptul"...?
> My local jobber has re-located---I'm curious if there might be some kind of 
> common automotive "...reasonable facsimile" that I'm unaware of...?
> ~73~ de Eddy VE3CUI - VE3XZ
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