It works. I ground a round hole through the glass in my aquarium so I
could run a plastic tube in through the side. I needed a close fit for
the tube so I could get the sealer to work. I used the eraser from  an
electric erasing tool from the drafting department where I worked as the
grinding tool. Applied toothpaste as the grinding agent, much like
lapping compound for lapping valves to the seats in the heads. It is a
VERY slow process, however. Took me a week of working at it off and on.
Didn't know of any other way to DRILL a hole in glass. Not my invention.
I saw the method on some craft show on TV.

John

John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com

On 6/22/2011 9:52 AM, Alistair Bell wrote:
> get away!
>
> really?
>
> the abrasive in toothpaste is something like calcium carbonate
> (chalk) , right?
>
> or are they adding carborundum to Crest now?
>
> :)
>
> John, have you done this trick?
>
>
> alistair
>
>
> On 22-Jun-11, at 7:16 AM, John Rodgers wrote:
>
>>
>> BTW - toothpaste applied on the  end of a rubber power eraser can be
>> used to grind a hole in glass, should you ever have the need to do so.
>>
>> John
>
>