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I started to make walton got a good amount of progress done then was having trouble with the masks. tried to fix it then all my progress got lost 
im going to try it again

hi guys im new to track building and am looking for help on masks I was following tfc's tutorials and i probably did something wrong in the steps. i was doing the mask for the grass and areas not associated with the track in the picture below thats all the sand that showed in mapveiwer and its on the track where i dont want it...   help guys