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There are automotive primers that will/advertised to take the 350 to 400 deg. heat
I have been working with one company for some time and once they get it perfected I will give the tube restorers...

Some of the repro Mk.II scopes that I have reworked have survived hundreds of miles the wilds of Canada strapped to an ATV and hundreds of shots, if not thousands.
The repro's can be "tarted up" and...