I am one HAPPY CAMPER today. You know why? I don't have to bond Uart to gatorboard using an adhesive anymore!!! I tried, for the first time, Uart 400 that is already mounted on 100% archival 4 ply Conservation Board, and it's easy to cut too!!! Not only that, when framing I don't ever have to worry about the rabbet... being too shallow for my painting because the new mounted Uart on board is much thinner than when it is bonded to gatorboard. Now there is plenty of room to fit the glass, spacer, and painting and it is strong enough that no backing board is needed at all! Thanks UART!! Great product!!