Abstract: The present invention is directed to a rack assembly comprising a plurality of support surfaces each having a planar face, wherein the planar face of each support surfaces comes into close proximity to one another such that one or more receiving voids are formed. Within the planar face of one or more of the support surfaces there are open areas which allow for the ambient environment of the rack assembly to come into fluid communication with the receiving void formed within the rack assembly. A receiving void is designed to receive a flexible reusable substrate having a front and back essentially planar surface and to maintain said flexible reusable substrate in an equivalent planar orientation of the rack assembly such that fluid communication with the ambient environment of the rack assembly will come into direct contact with a corresponding area of a flexible reusable substrate contained therein.