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Talk about trial and error, boy finding a solution to shielding a VLF double D coil was tough.
There are a few key issues I had to avoid and it seemed everything I tried failed due to one or more of them, cost, time consuming, inconsistant resistance, coil integrity i.e. lack of good adhesion, urethane resin acting like a solvent, urethane resin reacting chemically to nickel (foaming).
No sense rehashing the failures, let me tell you what worked incredibly well. I took some budget Lowes Home Improvement fiberglass resin and mixed it 2-3 to 1 (eyeballed the ratio will have to measure) with the nickel powder and got a silky smooth potion that spread like a dream, you can apply it as thin or thick as you like and it holds a shape well in thickness up to 1/8 inch. The nickel stayed nicely suspended in the resin with consistant resistance across an 8 inch test strip. No bubbles or foaming, couldn't ask for any better results.
Ohms per inch...
Very thin - 180 ohms
Thin - 25 ohms
Medium thick 15 ohms
Thick 7 ohms
There are a few key issues I had to avoid and it seemed everything I tried failed due to one or more of them, cost, time consuming, inconsistant resistance, coil integrity i.e. lack of good adhesion, urethane resin acting like a solvent, urethane resin reacting chemically to nickel (foaming).
No sense rehashing the failures, let me tell you what worked incredibly well. I took some budget Lowes Home Improvement fiberglass resin and mixed it 2-3 to 1 (eyeballed the ratio will have to measure) with the nickel powder and got a silky smooth potion that spread like a dream, you can apply it as thin or thick as you like and it holds a shape well in thickness up to 1/8 inch. The nickel stayed nicely suspended in the resin with consistant resistance across an 8 inch test strip. No bubbles or foaming, couldn't ask for any better results.
Ohms per inch...
Very thin - 180 ohms
Thin - 25 ohms
Medium thick 15 ohms
Thick 7 ohms
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