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I have never used the Indian Head Shellac but I would think that when dry it forms a very brittle film and may crack if it is sprayed onto the diaphragm and then flexed.
I have seen it applied to the body of the distributor and it clearly works this way.
The conformal coating application is a process carried out by a company that is close to our business and easy to make samples.
I have had some diaphragms cut with a gas purged laser and we will coat them in the next couple of weeks.
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