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Your a funny guy Jimmy.......:rofl2:

Neither do I, so don't feel bad. Also, consider the size, it may take a few more strokes than normal to get the desired result.

I have several Escher's, and I never notice anything build up on them. One stone is in a box and still has instructions, It say's, that a "Fine Slime" will develop when you use it.
Here's a pic of...