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Don't get the paper tooth fairy. That won't help a thing. If you're drawing away and you suddenly realize that your paper has lost its "tooth" or grip on your medium, just spray the work with a workable fixative. This will allow you to still modify the work, but it will also give you an added texture to the illustration board or paper. This way you can continue to add the final touches.
Make sure you are in a well-ventilated area when you use any aerosol.