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Re: Sealing Plexiglas
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, December 09, 1999 5:19 PM
Subject: Sealing Plexiglas
>Original Poster: Ted Rosenberg <TRosen1-at-Tandy-dot-com>
><snip>
>Has anyone actually sealed a secondary on Plexiglas with a 'material' that
>worked? if so, what and where and how much (US$ please).
I too have purchased a rather expensive piece of acrylic tubing.
and am experimenting with a sealer that has not been mentioned yet.
It is the new class of non-yellowing WATER based acrylic varnish,
marketed as "environmentally friendly" clear wood finish. One brand
I am experimenting with is "Flecto Varthane Diamond"
(some other "Varthanes" are solvent based).
I have coated test pieces of Plexiglas with it with no crazing at all.
The big questions remain as to dissipation, dielectric strength, moisture
retention etc.. I plan to heat cure the finish and then do more testing.
curious note: satin varnish, is made with mica flakes; better insulation?
Some other coatings that come to mind are:
High Solids 2 part epoxy (I have "West Systems Epoxy"; does not hurt
styrene)
Water borne urethanes
Water borne epoxies (airplane fabric coating)
carnuba wax
"no odor" (acetic acid free) RTV silicone rubber (regular RTV corrodes
copper)
conformal coatings used for printed circuit boards.
If the coating is as hygroscopic as the base material,
there is no point in a base coat; but the coating may still be useful
as insulation and as fixative to hold the windings in place.
Does any coiler have experience with these proposed "plexi-safe" coatings?