Go to your local paint store and buy a pack (50) of 80 grit sandpaper. Then buy a case of beer and plan a week of long nights. I used a makita sander with 80 grit and I did pretty good. It shouldnt take that long, but if you have stress cracks then you are in for a lot of work like myself. Like i said I used my little 4" makita because it was flat. I tried a orbital sander but I got too many dishes.Good luck and I hope this helps!