I believe Aquadag is a brand name for carbon disbursed in a water base medium to allow it to be painted on a surface. I've used it to make microwave loads about 35 years ago, but have not used or seen it since.
I you want an inexpensive shielding material, you can buy aluminized mylar film in...
While carbon black is an excellent conductor (carbon is a metal), when you support it in a plastic medium (epoxy, polyester) the dielectric of the prinforcing pastic with the carbon black creates an artificial dielectric with lossy properties. I have used this to make microwave loads very...
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The x's represent the solid etch pattern on a single sided board (two solid patches, a ground patch and a radiating...