For more information on microspheres, contact Chris Rosenbusch, Expancel Inc., 2240 Northmont Pkwy., Duluth, GA 30096; 770/813.9126; fax 770/813.8639; or visit www.expancel.com. Or contact Bruce Holcomb, 3M, 3M Ctr., Building 223-6S-04, St. Paul, MN 55144; 651/733.9233; fax 651/733.1659; or visit www.3m.com/paintsandcoatings.