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Glue for secondary mirror

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my ASA 400mm astrograph need a new aluminum coating.

I have coated both: primary and secondary mirror as well.

In order to proper coat, I have had to dismantle the secondary mirror, that was glued to the support.

The glue was a sort of black silicon or something similar.

What kind of glue should I use to fix again the secondary mirror to the support ?

Best Regards



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