Grinding plastic

You can submerge the flex-shaft in water, really?! I never knew that...

I wouldn't submerge it, but when your cutting with the bit in the water you get a lot of splashback on the tool. That could really damage you or your dremel if it was splashing on a motor. Usually when your done all you need to do is whipe the shaft off, and maybe a little lube at the end to prevent problems in the bushing.
 
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