I'm about to polish my 4th batch of rocks. 1st batch was jasper. http://i456.photobucket.com/albums/qq290/tedfishmon/100_2475.jpg which turned out pretty good. 2nd batch I polished up some agates and the 3rd batch was some plain jane rocks that turned out to look like river rock. For my next batch I'd like to try petrified wood. My question is. Will this work or will I end up with bits and pieces of polished petrified wood?