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The coating on typical MLS gaskets is, I believe an FKM material (Viton?).
The basic sheet is only available in 0.2mm thickness with 20 micron coating of FKM no either side producing a total thickness of 0.24mm hence my original question.
I can vacuum coat a 0.1mm thick diaphragm with 10 micron either side.
I would like to escape from mucking around with shellac if at all possible but have never learnt what the original coating used by Bosch comprised of and how it was applied.
I am convinced that original diaphragms were coated as when you rebuild a distributor without a sealant they always seem to leak.
All of the units I have seen rebuilt used a complete layer but it is worth a try with a small bead.
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