Re: [ATM] Scratches keep forming on edge of mirror

[William Marriott <bmarriott@pacbell.net>]

Adam;

You say that the dental plaster is not sealed. Does
there seem to be any kinds of granular material come
off the tool side if you rub it with your hands?
Perhaps it might be wise to coat the tool with
somekind of sealant to minimize, or at least eliminate
this as one of the variables that could be causing the
scratches.

Bill Marriott
StarlightOptical.com
--- Adam Krause <krausea34@yahoo.com> wrote:

> Dear ATMers,
> 
> I have made my tile tool and it now has good contact
> with the mirror surface (8" f/6.2) after grinding
> with
> 120 grit, then 220.  The tile tool is made from
> dental
> plaster- not dental stone, and is not sealed.  I am
> having a recurring problem with scratches.  These
> scratches are forming on the edge of the mirror
> only. 
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