An insulated glass unit, including two spacer applied lites including a first lite and a second lite. Each of the lites has a strand of thermoplastic spacer material applied thereto proximate and inset from a perimeter of each of the spacer applied lites. The two strands include a first strand applied to the first lite and a second strand applied to the second lite. The first strand and the second strand are joined together and cohesively bonded by contact between the first strand and the second strand thereby forming a primary seal of the insulated glass unit. The invention also includes methods of making such insulated glass units and manufacturing lines that enable making such insulated glass units.