Summary: We develop an approach to prove self-adjointness of Dirac operators with boundary or transmission conditions at a \(\mathcal{C}^2\)-compact surface without boundary. To do so we are lead to study the layer potential induced by the Dirac system as well as to define traces in a weak sense for functions in the appropriate Sobolev space. Finally, we introduce Calderón projectors associated with the problem and illustrate the method in two special cases: the well-known MIT bag model and an electrostatic \(\delta\)-shell interaction.