Date: 6/17/2009 10:50 am EDT
The grout will bond to itself so if you need to touch up some areas you won't have any problems. I wouldn't sand the grout but if the grout is higher than the tile carefully cut it out with a utility knife and fill in the areas with new grout. If there's grout or grout residue on the tile use Krud Kutter(available at most home centers)to clean. Grout repairs are no fun! If you take your time and work in small areas at a time you should be fine. Hope this helps. Let me know how it goes.