the present invention is an improved printable sheet for use in a variety of applications requiring extreme image durability and weather resistance . the printable sheet of the present invention employs an expanded polytetrafluoroethylene sheet comprising a series of polymeric nodes interconnected by fibrils . images can be applied to this sheet using a variety of means , including pen and ink , electrostatic printing , screen printing , offset printing , etc . these images have proven to be very durable and capable of substantial wear , water exposure , and general abuse . moreover , the printable sheet of the present invention is capable of being cleaned and reused over and over again once any given image is no longer of interest .