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I tried some nickel spray on shielding on my first prototype coils a while back and it was plenty conductive and easily passed a continuity test on my meter and I sprayed it on fairly thin. The paint stuck to the ABS plastic shell quite nicely.
Tonight I tried some carbon based shielding, I sprayed it on really thick, not by choice mind you, this stuff blasts out of the can like a darn firehose. Where it was too thick it cracked exposing bare ABS shell. Where it went on thin it covered well BUT...it did not stick to the ABS plastic shell well at all, a light brush with a finger nail would remove it right down to the bare ABS and so if I had poured the resin the whole thing would probably fall out without too much effort. On the conductive side...its not. Even in the thickest areas a continuity test failed make a peep even with the probes only 1/4 inch apart. The nickel conducted well with the probes 20 inches apart.
So I'm going to wrap the coil in tape, hose them down with the carbon spray, and encase it in resin and see if that works.
Tonight I tried some carbon based shielding, I sprayed it on really thick, not by choice mind you, this stuff blasts out of the can like a darn firehose. Where it was too thick it cracked exposing bare ABS shell. Where it went on thin it covered well BUT...it did not stick to the ABS plastic shell well at all, a light brush with a finger nail would remove it right down to the bare ABS and so if I had poured the resin the whole thing would probably fall out without too much effort. On the conductive side...its not. Even in the thickest areas a continuity test failed make a peep even with the probes only 1/4 inch apart. The nickel conducted well with the probes 20 inches apart.
So I'm going to wrap the coil in tape, hose them down with the carbon spray, and encase it in resin and see if that works.