Apply Tripoli (#13135) or Grinder???s Grease (#13119) directly to the spinning abrasive band when using the Trizact A30, #13115C, (comparable to 700 grit) or the Trizact A16 , #13115D, (comparable to 1200 grit), on aluminum or other soft metals to assure a smooth cut, and prevent metal pick-up. (Metal pickup results in a rougher surface by removing grains of metal and depositing them in a differen