Maria- The National Park Service has a CD available titled " Exhibit Conservation Guidelines" that answers this and many other questions. You can find out more about it at their web site. Go to www. nps.gov and search on Exhibit Conservation Guidelines. We use a "medium density fibreboard" called Medex, which looks like a sheet of plywood with a smooth, covered surface. No off gassing problems and easy to cut and paint. Kenneth DeRoux Curator of Museum Services Alaska State Museum 395 Whittier Street Juneau, AK 99801 (907) 465-2396 [log in to unmask] www.museums.state.ak.us ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).