Re: [ATM] Pitch Substitute for very fast mirrors

[hermit <hermit@outofoptions.org>]

Kevin MIchael Zabbo wrote:
> Pitch does have a lot of useful characteristics that I
> won't get into here, but it has a flaw that I need to
> point out.
>
> Fast and large mirrors, say 13" f/3, have a deviation
> from sphere that can be measured on a decent
> micrometer, which is far too big a gap for pitch to
> conform.  The pitch, even if soft, takes a long time
> to flow.
>
>   
Have you tried heavy weight with pitch?  It works better if you have a 
machine, but slow speeds and heavy weights work well.  Plus, you are 
using a sub diameter lap so there should be less of an issue in terms of 
flow.

Ken Lowther
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