Sonix NDT can conduct Holiday testing (also known as Continuity Testing) on protective coatings to detect unacceptable discontinuities such as pinholes and voids. This testing is for non visible discontinuities in coatings. The test is carried out by checking an electric circuit to see if current flows to complete the circuit. In areas where there is not enough coating to resist the electrical charge voids and holes are detected. In other words, if the electrical charge is detected, then there are discontinuities. This testing is applied on tank interiors, chemical storage vessels and buried structures. The purpose is to ensure that the coating can withstand such environments.