To: 
Reply-To: "Scott Berfield" 




Sigh. I was pretty much done with 500 grit on my 12 1/2" -- and quite
pleased with how well it was going. As the mirror dried I saw a 1/2"
long scratch appear. It looked like a surface scuff but after anotehr wet
it showed its true nature - craters the size of elephants (well at 10X
anyway) in a line. I am not a good judge of sizes, but these look larger
than the 500 can easily get rid of. I know I need to drop back a grit size
and get rid of this horrible thing, but is there a good way to estimate
whether I need to go all the way back to 120, or if 240 suffice?

-sb

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