Dye Penetrant Testing is commonly used in industries like aerospace, automotive, manufacturing, and construction to detect surface defects that could compromise the safety or integrity of a component or structure. It is a valuable tool for identifying cracks, porosity, leaks, and other discontinuities that may not be visible to the naked eye. It is important to note that DPT is most effective for detecting surface-breaking defects and may not be suitable for detecting defects deeper within a material.