a process for making a multilayered formable plastic composite laminate and a process for its manufacture which includes preparing an acrylic composition which includes the reaction product of a mixture of predominantly an acrylic monomer and a substantially lesser amount of a polymer thereof , at least one free radical reaction initiating reaction catalyst , and optionally , a chain length regulating agent or a cross - linking agent ; deaerating the acrylic composition ; casting the deaerated acrylic composition upon a sheet or laminate of a thermoplastic material ; and curing the cast acrylic composition in several successive stages so as to substantially polymerize the acrylic monomer and to permit penetration of the acrylic composition preferably to a depth of between about 0 . 001 - 0 . 1 inch into thermoplastic material to form a laminate having a uniform and gradual acrylic / thermoplastic interphase , rather than a sharp separation between the layers thereof , so as to prevent delamination during further processing operations . these laminates are then thermoformed into various shaped articles .