Mix of soda and sandpaper afterwards should do the trick with no harm done. In case of any doubt I always check up or forum here, or consult web:
http://www.preferredabrasives.com/abrasive-grain-types.html
http://www.scienceclarified.com/A-Al/Abrasives.html...
Facing same problem as the first poster I read all your answers first and I must say as, at first, I felt that my head was full of new info I started to process the data slowly. You're very helpful and very insightful peeps and all that is left for me is to say thank you. I grabbed Galaxy 7" and...