From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


If you are getting dog buscuit then you need to change CeO at the minimum
and probably to rouge.  This cures the dog buscuit in about 30 minutes of
polishing.  The change merely needs to be a light scrubbing of the lap to
remove the loose CeO and roughen the surface a little bit and then use the
rouge on the lap.
Unfortunately, any work by a lap on a mirror will change its figure so if
you have a particular stroke that you are doing, you will have to continue
that stroke as long as it has been producing a stable surface. Scratches
are generally from bad water, dirt falling from somewhere including your
shirt and hair or from stuff that fell into the CeO. Generally if you can
see them from the tester, they are real scratches that have chipped the
surface rather than sleek type scratches which don't chip the surface.  If
you have the chips, you will havet to continue polishing the mirror further
to get rid of the chipped surface.  Since you are already basically
polished already, that will take some time and will definitely affect the
surface shape a lot.
Good luck!  Getting a scratch in the mirror means a lot more work ahead! Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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