Good question,
It all depends if Wayne Sainty from
www.saintech.com is still in business or has managed to onsell the business to a new owner.
wayne@saintech.com is the contact, I'm off to get my blanks.
I'm a fair way away from needing to know atm, but if you do get a response or answer to that question, please post. I know others are keen to find a astronomical mirror coating services here in Oz.
Steve