In article , MC
wrote:

I am making some practice forms and experimenting with pigment before
making my own concrete countertops. I have the book by Du-Teng Cheng
and he says to sand using water, diamond sand paper and an electrical
sander. I am not finding these at any of the home improvement stores.
Can you use regular sandpaper? Anyone have any experience with this?

You'll find it at lapidary suppliers -- people who cut gems and other
stones. It's about $1.00 per square inch. Dr. Cheng probably makes
enough profit from his countertops to afford lots of it.

http://www.xmission.com/~ranthon/coated-abrasive.htm

-chib

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