A
vascular graft, such as an AAA
stent graft, includes a core zone of PET fabric with a non-
porous coating comprising a
polyurethane, such as Thoralon®, disposed on at least one surface. The
coating provides a barrier to prevent short and long term leakage of fluids through the pores of the PET fabric core zone. A method for sealing the pores of a porous PET graft includes the step of
coating at least one surface of said graft with at least one
polyurethane, or mixtures and combinations thereof. Preferably, the
coating is Thoralon®. A method for making a
vascular prosthesis includes the steps of providing a core zone of PET fabric, and coating at least one surface of the core zone with at least one
polyurethane, or mixtures and combinations thereof, such as Thoralon®. Finally, a method of repairing or treating a defective vessel includes the step of reinforcing or replacing the defective vessel with a graft according to the invention.