MIXED MEDIA: COLLAGING WITH FLAT TEXTILES
GAC 400 will permeate fabric*, stiffening it as it dries. Since acrylic bonds to acrylic, once dry, the saturated fabric should provide an excellent bond with other acrylics. Expect some gloss on the surface and a slight darkening of the fabric. Care should be taken not to roll, stretch or bend any fabric or paper stiffened with GAC 400 as micro cracks may form that could eventually decrease the stiffness of the material). Depending on your specific application, you may opt to heat-set GAC 400 to decrease water sensitivity, and increase the stiffening properties to some degree.
For more information: https://justpaint.org/gac-400-fabric-and-paper-stiffener/