To identify the existing challenges of using inaccessible interfaces of home and work appliances, we conducted a formative study with six blind participants. We identified four design requirements for a system to augment physical interfaces for non-visual access: (i) the solution for tactile labeling must enable blind users to independently augment and access their appliances without sighted assistance, (ii) the augmented labels should be customizable to address individual needs, (iii) the solution should allow for learning and memorization of the interface, and (iv) the tactile labels must support easy attachment and reproduction for repeated use.